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Canadian Oil Sands Trust Second Quarter Report 2010 1 Canadian Oil Sands Trust announces 2010 second quarter results All financial figures are unaudited and in Canadian dollars unless otherwise noted.

Financials

TSX - COS.UN

Calgary, Alberta (July 29, 2010) – Canadian Oil Sands Trust (“Canadian Oil Sands”, the “Trust” or “we”) today announced second quarter 2010 cash from operating activities of $358 million, or $0.74 per Unit, compared with cash used in operating activities of $44 million, or $0.09 per Unit, for the same quarter in 2009. The increase was due to higher revenues during the second quarter of 2010 compared with 2009, partially offset by higher Crown royalties. Year-to-date cash from operating activities increased to $667 million for 2010 from $6 million in 2009. The increase was mainly due to higher revenues, partially offset by higher Crown royalties.

Net income for the second quarter of 2010 was $237 million, or $0.49 per Unit, compared with $46 million, or $0.10 per Unit, recorded in the second quarter of 2009. Net income was also higher in the first six months of 2010 than in the same period of 2009, totaling $404 million, or $0.83 per Unit, versus $89 million, or $0.18 per Unit. The increases in net income primarily reflect higher revenues partially offset by higher Crown royalties and foreign exchange losses.

The Trust has declared a distribution of $0.50 per Unit payable on August 31, 2010 to Unitholders of record on August 23, 2010. The $0.50 per Unit third quarter distribution reflects the Trust’s objective of increasing tax pools to approximately $2 billion by the end of 2010, which may raise debt levels if achieved. As a result of this strategy, in 2010 the Trust expects distributions to exceed cash from operating activities less its capital expenditures. Beyond 2010, the Trust will look to avoid significant increases in net debt in advance of a larger sustaining capital program and future expansion plans. As we have done in the past, we will use cash from operating activities as a source of investment financing. Our anticipation of an increase in capital expenditures, therefore, indicates a reduction in distributions in order to reinvest in our business post-2010. Further information about distribution/dividend payments is described under “Unitholder Distributions” in the Management’s Discussion and Analysis (“MD&A”) section of this report.

“Production at Syncrude was strong during the second quarter of 2010, averaging 324,000 barrels per day,” said Marcel Coutu, President and Chief Executive Officer. “We were expecting these robust rates to continue into the third quarter, however, unplanned outages, particularly recent outages in the upgrader

Canadian Oil Sands Trust Second Quarter Report 2010 1 during July, have led us to reduce our 2010 annual production outlook by five million barrels for Syncrude to 110 million barrels. While these outages have all been remedied, the resulting production impact illustrates why the current focus on reliability is paramount and key to achieving design capacity of 350,000 barrels per day.”

During the second quarter of 2010, Canadian Oil Sands’ sales volumes averaged approximately 119,000 barrels per day compared with 76,000 barrels per day for the second quarter of 2009. For the first half of 2010, sales volumes averaged about 109,000 barrels per day compared to an average of 89,000 barrels per day during the comparable period in 2009. Sales volumes for 2010 reflect: the turnaround of the LC Finer and associated upgrading units, unplanned maintenance on a hydrotreater in the first quarter, and unplanned repairs and maintenance on two diluent recovery units in the second quarter. By comparison, sales volumes for 2009 were impacted by: the Coker 8-3 turnaround, circulation issues in Coker 8-1, reliability issues in mining and upgrading operations, and constrained bitumen production during the first quarter.

Canadian Oil Sands’ operating costs were $336 million, or $31.18 per barrel, in the second quarter of 2010, compared to $345 million, or $50.23 per barrel, in the same quarter of 2009. The decrease in operating costs was primarily due to lower turnaround costs and stock-based compensation expenses in the second quarter of 2010, partially offset by additional mining activities to support higher production levels and additional unplanned repairs and maintenance. Lower per barrel operating costs also reflect the increased sales volumes in 2010.

The Syncrude Joint Venture’s (“Syncrude”) total recordable injury rate year-to-date for 2010 was 0.40 compared with a rate of 0.37 for the same period of 2009. Strong safety performance for Syncrude is a priority with efforts focused on achieving an injury-free workplace.

Canadian Oil Sands Trust Second Quarter Report 2010 2

CANADIAN OIL SANDS TRUST Highlights

Three Months Ended Six Months Ended June 30 June 30

(millions of Canadian dollars, except per Trust Unit and per barrel volume amounts) 2010 2009 2010 2009

Net Income $ 237 $ 46 $ 404 $ Per Trust Unit - Basic $ 0.49 $ 0.10 $ 0.83 $ 0.18

Cash from (used in) Operating Activities $ 358 $ (44) $ 667 $ 6 Per Trust Unit $ 0.74 $ (0.09) $ 1.38 $ 0.01

Unitholder Distributions $ 242 $ 73 $ 412 $ Per Trust Unit $ 0.50 $ 0.15 $ 0.85 $ 0.30

Sales Volumes (1)

Total (MMbbls)10.86.8 19.716.1
Daily average (bbls)118,56975,553108,98089,114
Operating Costs ($/bbl)$31.18$50.23$34.99$43.66
Net Realized SCO Selling Price ($/bbl)$78.07$67.92$79.87$60.69
West Texas Intermediate (average $US/bbl)(2)$78.05$59.79$78.46$51.68

(1) The Trust's sales volumes differ from its production volumes due to changes in inventory, w hich are primarily in-transit pipeline volumes, and are after purchased crude oil volumes.

(2) Pricing obtained from Bloomberg.

Canadian Oil Sands Trust Second Quarter Report 2010 3

Outlook

The Trust has revised its outlook for 2010. Syncrude production is now estimated to total 110 million barrels (40.4 million barrels net to the Trust), with a production range of 108 million to 113 million barrels. We are estimating operating costs of approximately $37 per barrel, and capital expenditures totaling $544 million. Based on the Trust’s assumption of WTI crude oil averaging U.S. $75 per barrel in 2010, together with the other assumptions outlined in our outlook, we are estimating cash from operating activities of $1,098 million, or $2.27 per Unit in 2010.

More information on the Trust’s outlook is provided in the MD&A section of this report and the July 29, 2010 guidance document, which is available on our web site at www.cos-trust.com under “Investor”.

Corporate Conversion

Canadian Oil Sands is continuing with its plans to convert to a corporate structure on or about December 31, 2010. The arrangement to convert has been approved by Canadian Oil Sands’ Board, its Unitholders and the Court of Queen's Bench of Alberta. Following conversion to a corporate structure, Canadian Oil Sands expects its approach to dividend payments to be very similar to its management of distribution payments as a Trust. See the “Unitholder Distributions” section of the MD&A below for discussion on the dividend approach following conversion.

Syncrude Sustainability Report

Syncrude’s 2008/2009 Sustainability Report has been posted on Syncrude’s website at www.syncrude.ca. The report describes Syncrude’s economic, environmental and social performance in 2008 and 2009; highlights include:

  • Cumulative land reclaimed now totals 4,567 hectares

 Landscape construction began on a 52-hectare wetland, including the industry's first reclaimed fen

  • Cumulative spending of $1.4 billion with Aboriginal-owned businesses since 1992
  • Community investment of $7.5 million during 2008/09
  • $6.3 billion in procurement of goods and services across Canada during 2008/09

A copy of the report or a summary of the highlights can be requested by email to [email protected].

Syncrude Waterfowl Incident

In February 2009, Syncrude Canada Ltd. (“Syncrude Canada”) was charged under the Federal Migratory Birds Convention Act and the Alberta Environmental Protection and Enhancement Act for a 2008 waterfowl incident. On June 25, 2010, a provincial court judge ruled in favour of the federal and provincial Crowns on the case involving this waterfowl incident. A further hearing on the matter is scheduled for August 20, 2010. Syncrude continues to review the basis of the conviction before determining if any further action, including any potential appeal, will be made.

Canadian Oil Sands Trust Second Quarter Report 2010 4 Syncrude has always acknowledged its moral obligations for this waterfowl incident and has implemented new waterfowl deterrent systems. Syncrude and its owners remain committed to improving their environmental performance. More information on the environmental issues is contained in the Annual Information Form of the Trust dated March 22, 2010.

Syncrude Appoints New President and CEO

Scott Sullivan has been appointed to the role of President and Chief Executive Officer of Syncrude Canada effective August 1, 2010. Mr. Sullivan succeeds Tom Katinas, who was assigned to the position in May 2007 for a three-year term. Both are employees of ExxonMobil Corp. (“ExxonMobil”) seconded to Syncrude under the Management Services Agreement (“MSA”) between Syncrude and Imperial Oil Resources Ltd.

Mr. Sullivan brings extensive operating experience to Syncrude, having worked at a number of ExxonMobil refining facilities around the world. In his most recent assignment, he held the position of deputy general manager of the Fujian Refining and Petrochemical Co., a major refining and petrochemical joint venture among ExxonMobil, Sinopec, Saudi Aramco and the Chinese province of Fujian.

This press release contains forward-looking statements, which are qualified by the advisory in the MD&A section of this report.

Canadian Oil Sands Trust Second Quarter Report 2010 5

MANAGEMENT’S DISCUSSION AND ANALYSIS

The following Management’s Discussion and Analysis (“MD&A”) was prepared as of July 29, 2010 and should be read in conjunction with the unaudited interim consolidated financial statements of Canadian Oil Sands Trust (“Canadian Oil Sands” or the “Trust”) for the three and six months ended June 30, 2010 and June 30, 2009, the audited consolidated financial statements and MD&A of the Trust for the year ended December 31, 2009 and the Trust’s Annual Information Form (“AIF”) dated March 22, 2010. Additional information on the Trust, including its AIF, is available on SEDAR at www.sedar.com or on the Trust’s website at www.cos-trust.com. The Trust’s financial results have been prepared in accordance with Canadian Generally Accepted Accounting Principles (“GAAP”) and are reported in Canadian dollars, unless stated otherwise.

ADVISORY- in the interest of providing the Trust’s Unitholders and potential investors with information regarding the Trust, including management’s assessment of the Trust’s future production and cost estimates, plans and operations, certain statements throughout this MD&A and the related press release contain “forward-looking statements” under applicable securities law. Forward-looking statements in this MD&A include, but are not limited to, statements with respect to the cost estimate for the Sulphur Emissions Reduction (“SER”) project and the expectation that the SER project will significantly reduce total sulphur dioxide and other emissions; the completion date for the SER project; future distributions and any increase or decrease from current payment amounts; the Trust’s plans with regard to its net debt level by the end of 2010 and beyond; the expected impact on Syncrude Canada Ltd. (“Syncrude Canada”) of being convicted under both federal and provincial charges related to the waterfowl incident; plans regarding crude oil hedges and currency hedges in the future; the expected production, revenues and operating costs for 2010; the expected level of sustaining capital for the next few years and longer term; the expectations regarding capital expenditures and operating costs; the plans and expected impact of converting to a corporate structure; the plans and expected impact of adopting International Financial Reporting Standards including, without limitation, its impact on the Trust’s accounting policies, financial statement disclosure, information technology requirements, data systems, internal controls and business activities, and the results that the Syncrude Joint Venture (“Syncrude”) reports to the Trust; the expected impact of any current and future environmental legislation, including without limitation, regulations relating to tailings; the expected funding increases in 2010 for the Trust’s share of Syncrude’s pension and reclamation funding; the expected realized selling price, which includes the anticipated differential to WTI to be received in 2010 for Canadian Oil Sands’ product; the potential amount payable in respect of any future income tax liability; the level of energy consumption in 2010 and beyond; capital expenditures for 2010; the level of natural gas consumption in 2010 and beyond; the expected price for crude oil and natural gas in 2010, and the anticipated impact that certain factors such as natural gas and oil prices, foreign exchange and operating costs have on the Trust’s cash from operating activities and net income. You are cautioned not to place undue reliance on forward-looking statements, as there can be no assurance that the plans, intentions or expectations upon which they are based will occur. By their nature, forward-looking statements involve numerous assumptions, known and unknown risks and uncertainties, both general and specific, that contribute to the possibility that the predictions, forecasts, projections and other forward-looking statements will not occur. Although the Trust believes that the expectations represented by such forward-looking statements are reasonable, there can be no assurance that such expectations will prove to be correct. Some of the risks and other factors which could cause results to differ materially from those expressed in the forward-looking statements contained in this MD&A include, but are not limited to: the impacts of regulatory changes especially as such relate to royalties, taxation, and environmental charges; the impact of technology on operations and processes and how new complex technology may not perform as expected; skilled labour shortages and the productivity achieved from labour in the Fort McMurray area; the supply and demand metrics for oil and natural gas; the impact that pipeline capacity and refinery demand have on prices for our products; the unanimous joint venture owner approval for major expansions and changes in product types; the variances of stock market activities generally; global economic environment/volatility of markets; normal risks associated with litigation, general economic, business and market conditions; the impact of any decisions rendered by a court in relation to litigation including without limitation: the decision relating to the trial against Syncrude Canada regarding the 2008 waterfowl incident, regulatory change, the impact of Syncrude being unable to meet the conditions of its approval for its tailings management plan under Directive 074, and such other risks and uncertainties described from time to time in the Trust’s Annual Information Form dated March 22, 2010 and in the reports and filings made with securities regulatory authorities by the Trust as well as those assumptions outlined in the Trust’s guidance document being correct. You are cautioned that the foregoing list of important factors is not exhaustive. No assurance can be given that the final legislation implementing the federal tax changes regarding income trusts will not be further changed in a manner which adversely affects the Trust and its Unitholders. Furthermore, the forward-looking statements contained in this MD&A are made as of the date of this MD&A, and unless required by law, the Trust does not undertake any obligation to update publicly or to revise any of the included forward-looking statements, whether as a result of new information, future events or otherwise. The forward-looking statements contained in this MD&A are expressly qualified by this cautionary statement.

Canadian Oil Sands Trust Second Quarter Report 2010 6

REVIEW OF SYNCRUDE OPERATIONS

During the second quarter of 2010, crude oil production from the Syncrude Joint Venture (“Syncrude”) totaled 29.5 million barrels, or 324,000 barrels per day, compared with 18.8 million barrels, or 206,000 barrels per day, during the same period of 2009. Net to the Trust, production totaled 10.8 million barrels in the second quarter of 2010 compared with 6.9 million barrels in the second quarter of 2009, based on our 36.74 per cent working interest.

Production volumes in the second quarter of 2010 were stronger than the same period in the prior year. While the second quarter of 2010 was impacted by unplanned repairs and maintenance on two diluent recovery units, the second quarter of 2009 was impacted by a scheduled turnaround of Coker 8-3 and related units, circulation issues with Coker 8-1 and operational reliability issues.

Year-to-date, Syncrude produced 53.7 million barrels in 2010, or about 297,000 barrels per day, compared with 43.4 million barrels, or about 240,000 barrels per day in 2009. Production in 2010 reflects the first quarter turnaround of the LC Finer and associated upgrading units and unplanned repairs and maintenance on a hydrotreater and two diluent recovery units. Production volumes in the first half of 2009 were impacted by a coker turnaround, coker circulation and operational reliability issues as well as first quarter 2009 bitumen production constraints.

Canadian Oil Sands’ operating costs were $336 million, or $31.18 per barrel, in the second quarter of 2010, compared to $345 million, or $50.23 per barrel, in the same quarter of 2009 (see the “Operating Costs” section of this MD&A for further discussion).

Syncrude’s facilities have the design capability to produce approximately 375,000 barrels per day when operating at full capacity under optimal conditions and with no downtime for maintenance or turnarounds. Under normal operating conditions, scheduled downtime is required for maintenance and turnaround activities and unscheduled downtime will occur as a result of operational and mechanical problems, unanticipated repairs and other slowdowns. When allowances for such downtime are included, the daily design productive capacity of Syncrude’s facilities is approximately 350,000 barrels per day on average and is referred to as “barrels per calendar day”. All references to Syncrudes’ production capacity in this report refer to barrels per calendar day, unless stated otherwise. The Trust’s production volumes differ from its sales volumes due to changes in inventory, which are primarily in-transit pipeline volumes.

Canadian Oil Sands Trust Second Quarter Report 2010 7

SUMMARY OF QUARTERLY RESULTS

2010 20092008
($ millions, except per Trust Unit and volume amounts) Q2 Q1 Q4 Q3 Q2 Q1 Q4 Q3
Revenues (1) Net income Per Trust Unit, Basic & Diluted Cash from operating activities Per Trust Unit (2) Unitholder distributions Per Trust Unit Daily average sales volumes (bbls) (3) Net realized SCO selling price ($/bbl) (4) Operating costs ($/bbl) (5)$ 8 42 $ 7 34 $ 2 37 $ 1 67 $ 0 .49 $ 0 .35 $ 3 58 $ 3 09 $ 0 .74 $ 0 .64 $ 2 42 $ 1 70 $ 0 .50 $ 0 .35 118,569 99,286 $ 78.07 $ 82.06 $ 31.18 $ 39.59 $ 3 .68 $ 4 .95 $ 78.05 $ 78.88 $ 0 .97 $ 0 .96 $ 0 .94 $ 0 .98$ 8 63 $ 773 $ 467 $ 512 $ 96 $ 247 $ 4 6 $ 43 $ 0 .20 $ 0.51 $ 0.10 $ 0.09 $ 3 28 $ 213 $ ( 44) $ 50 $ 0 .68 $ 0.44 $ (0.09) $ 0.10 $ 1 69 $ 121 $ 7 3 $ 72 $ 0 .35 $ 0.25 $ 0.15 $ 0.15 119,287 114,544 75,553 102,825 $ 78.67 $ 73.31 $ 67.92 $ 55.32 $ 30.18 $ 27.80 $ 50.23 $ 38.78 $ 4 .33 $ 2.90 $ 3.09 $ 4.96 $ 76.13 $ 68.24 $ 59.79 $ 43.31 $ 0 .95 $ 0.91 $ 0.86 $ 0.80 $ 0 .96 $ 0.93 $ 0.86 $ 0.79$ 704 $ 1 ,381 $ 124 $ 604 $ 0.26 $ 1.25 $ 466 $ 921 $ 0.97 $ 1.91 $ 361 $ 602 $ 0.75 $ 1.25 110,197 116,656 $ 69.40 $ 127.55 $ 32.10 $ 3 2.15
Purchased natural gas price ($/GJ)$ 6.41 $ 7.86
West Texas Intermediate (avg. US$/bbl) (6) Foreign exchange rates (US$/Cdn$): Average Quarter-end$ 59.08 $ 118.22 $ 0.83 $ 0.96 $ 0.82 $ 0.94
(1) Revenues after crude oil purchases and transportation expense. (2) Cash from operating activities per Trust Unit is a non-GAAP measure that is derived from cash from operating activities reported on the Trust's Consolidated Statements of Cash Flow s divided by the w eighted-average number of Trust Units outstanding in the period, as used in the Trust's net income per Unit calculations. (3) Daily average sales volumes after crude oil purchases. (4) Net realized SCO selling price after foreign currency hedging. (5) Derived from operating costs, as reported on the Trust's Consolidated Statements of Income and Comprehensive Income, divided by the sales volumes during the period. (6) Pricing obtained from Bloomberg.

During the last eight quarters, the following items have had a significant impact on the Trust’s financial results:

  • Fluctuations in U.S. dollar WTI oil prices have impacted the Trust’s revenues, Crown royalties, net income and cash from operating activities;
  • Net income was reduced in the fourth quarter of 2009 by $148 million due to an impairment charge and goodwill write-down on the Arctic natural gas assets;
  • Planned and unplanned maintenance activities as well as turnarounds have impacted quarterly production volumes, sales revenue and operating costs;
  • U.S. to Canadian dollar exchange rate fluctuations have resulted in foreign exchange gains and losses on the revaluation of U.S. dollar denominated debt and have impacted commodity pricing;
  • Transition to a new Crown royalty framework effective January 1, 2009; and
  • Tax rate reductions substantively enacted in the first quarter of 2009 resulted in additional future income tax recoveries of $63 million.

Quarterly variances in net income and cash from operating activities are caused mainly by fluctuations in crude oil prices, production and sales volumes, operating costs and natural gas prices. Net income also is impacted by unrealized foreign exchange gains and losses, impairment charges and future income tax amounts. While the supply/demand balance for crude oil affects selling prices, the impact of this equation is difficult to predict and quantify and has not displayed significant seasonality. Natural gas prices are

Canadian Oil Sands Trust Second Quarter Report 2010 8 typically higher in winter months as heating demand rises, but this seasonality is influenced by weather conditions and North American natural gas inventory levels.

Syncrude production levels may not display seasonal patterns or trends. While maintenance and turnaround activities are typically scheduled to avoid the winter months, the exact timing of unit shutdowns cannot be precisely scheduled, and unplanned outages may occur. Maintenance and turnaround activities impact both production volumes and operating costs. In addition, a large proportion of operating costs are fixed and, as such, per barrel operating costs are variable to production volumes. The costs associated with these activities are expensed in the period they are incurred, which can lead to significant increases in operating costs. The effect on per barrel operating costs of these maintenance activities is amplified as the facility is generally producing at reduced rates when maintenance work is occurring.

REVIEW OF FINANCIAL RESULTS

In the second quarter of 2010, the Trust reported net income of $237 million, or $0.49 per Unit, compared with $46 million, or $0.10 per Unit, recorded in the second quarter of 2009. The increase in net income reflects higher revenues partially offset by higher Crown royalties. In addition, the second quarter of 2010 included foreign exchange losses whereas the second quarter of 2009 included foreign exchange gains.

Net income for the first six months of 2010 totaled $404 million, or $0.83 per Unit compared with net income of $89 million, or $0.18 per Unit, recorded in 2009. The increase reflects higher revenues partially offset by higher Crown royalties. In addition, 2010 included foreign exchange losses whereas 2009 included foreign exchange gains.

Revenues after crude oil purchases and transportation costs totaled $842 million in the second quarter of 2010 versus $467 million in the second quarter of 2009. On a year-to-date basis, revenues after crude oil purchases and transportation costs totaled $1,576 million in 2010 versus $979 million for the first half of 2009. The increases in revenues were due mainly to higher crude oil prices and higher production volumes in 2010 (see the “Revenues after Crude Oil Purchases and Transportation Expense” section of this MD&A for further discussion).

Cash from operating activities was $358 million, or $0.74 per Unit, for the second quarter of 2010. This compares with cash used in operating activities of $44 million, or $0.09 per Unit, for the second quarter of 2009. The increase was due to higher revenues during the second quarter of 2010 than in the same period of 2009, partially offset by higher Crown royalties. Year-to-date cash from operating activities increased to $667 million for 2010 from $6 million in 2009. The increase was due to higher revenues

Canadian Oil Sands Trust Second Quarter Report 2010 9 partially offset by higher Crown royalties. In addition, non-cash working capital decreased during the first half of 2010 versus an increase during the first half of 2009.

Non-cash working capital reduced cash from operating activities by $14 million in the second quarter of 2010, primarily as a result of lower accounts payable at June 30, 2010 relative to March 31, 2010. By comparison, non-cash working capital decreased cash from operating activities by $67 million in the second quarter of 2009, primarily as a result of higher accounts receivable, reflecting higher oil prices, as well as higher inventory levels and lower accounts payable at June 30, 2009 relative to March 31, 2009.

In the first six months of 2010, non-cash working capital increased cash from operating activities by $90 million, primarily as a result of higher accounts payable and lower accounts receivable at June 30, 2010 relative to December 31, 2009. In the same period of 2009, non-cash working capital decreased cash from operating activities by $86 million, primarily as a result of higher accounts receivable and higher inventory levels at June 30, 2009 relative to December 31, 2008.

Non-cash working capital and changes therein can vary significantly on a period-by-period basis as a result of the timing and settlements of accounts receivable and accounts payable balances, and are impacted by a number of factors including changes in: revenue, operating expenses, Crown royalties, capital expenditures, inventory fluctuations, and the timing of payments.

Non-GAAP Financial Measures

In this MD&A we refer to financial measures that do not have any standardized meaning as prescribed by Canadian Generally Accepted Accounting Principles (“GAAP”). These non-GAAP financial measures include cash from operating activities on a per Unit basis, net debt, total capitalization, net debt to total capitalization, and certain per barrel measures. Cash from operating activities per Unit is calculated as cash from operating activities as reported on the Trust’s Consolidated Statement of Cash Flows divided by the weighted-average number of Units outstanding in the period. This measure is an indicator of the Trust’s capacity to fund capital expenditures, distributions, and other investing activities without incremental financing. In addition, the Trust refers to various per barrel figures, such as net realized selling prices, operating costs and Crown royalties, which also are considered non-GAAP measures. We derive per barrel figures by dividing the relevant revenue or cost figure by our sales volumes, which are after purchased crude oil volumes in a period.

Non-GAAP financial measures provide additional information that we believe is meaningful regarding the Trust’s operational performance, its liquidity and its capacity to fund distributions, capital expenditures and other investing activities. Users are cautioned that non-GAAP financial measures presented by the Trust may not be comparable with measures provided by other entities.

Canadian Oil Sands Trust Second Quarter Report 2010 10

Net Income per Barrel

Three Months Ended Six Months Ended June 30 June 30 ($ per bbl) 1 2010 2009 Variance 2010 2009 Variance
Revenues after crude oil purchases and transportation expense Operating costs Crown royalties78.12 67.92 10.20 79.92 60.69 (31.18) (50.23) 19.05 (34.99) (43.66) (7.88) (3.33) (4.55) (8.27) (1.69)19.23 8.67 (6.58) 21.32
39.06 14.36 24.70 36.66 15.34
(1.78) (5.65) 3.87 (2.80) (4.46) (0.95) (1.15) 0.20 (1.04) (0.96) (2.02) (3.64) 1.62 (2.44) (2.78) (8.74) (11.82) 3.08 (9.99) (11.60) (0.44) - (0.44) (0.24) - (3.59) 11.22 (14.81) (0.28) 2.96 0.47 3.37 (2.90) 0.60 6.99
Non-production costs Administration and insurance Interest, net Depreciation, depletion and accretion Loss on disposal of assets Foreign exchange gain (loss) Future income tax recovery and other1.66 (0.08) 0.34 1.61 (0.24) (3.24) (6.39)
(17.05) (7.67) (9.38) (16.19) (9.85)(6.34) 14.98
Net income per barrel22.01 6.69 15.32 20.47 5.49
10.8 6.8 4.0 19.7 16.1
Sales volumes (MMbbls) 23.6
1 Unless otherwise specified, net income and other per barrel measures in this MD&A have been derived by dividing the relevant revenue or cost item by the sales volumes in the period.
2 Sales volumes, after purchased crude oil volumes.

Revenues after Crude Oil Purchases and Transportation Expense

Three Months Ended Six Months Ended June 30 June 30 ($ millions) 2010 2009 Variance 2010 2009 Variance
Sales revenue 1 Crude oil purchases Transportation expense$ 8 79 $ 5 25 $ 3 54 $ 1,777 (29) (52) 23 (188) (9) (7) (2) (15)$ 1,073 $ 7 04 (81) (107) (15) - 977 597 2 - $ 9 79 $ 5 97 16.1 3.6
Currency hedging gains 1841 466 375 1,574 1 1 - 2
$ 8 42 $ 4 67 $ 3 75 $ 1,576
Sales volumes (MMbbls) 210.8 6.8 4.0 19.7
1 The sum of sales revenue and currency hedging gains equals Revenues on the Trust's Consolidated Statements of Income and Comprehensive Income. Sales revenue includes revenue from the sale of purchased crude oil and sulphur revenue. 2 Sales volumes, after purchased crude oil volumes. ($ per barrel)
Realized SCO selling price before hedging 3 Currency hedging gains$ 77.98 $ 67.79 $ 10.19 $ 79.78 0.09 0.13 (0.04) 0.09$ 60.58 $ 19.20 0.11 (0.02) $ 60.69 $ 19.18
Net realized SCO selling price$ 78.07 $ 67.92 $ 10.15 $ 79.87
3 SCO sales revenuvolumes.

The increase in sales revenue after crude oil purchases and transportation expense in the second quarter of 2010 versus 2009 primarily reflects a higher realized selling price for our synthetic crude oil (“SCO”) combined with higher sales volumes. During the second quarter of 2010, WTI averaged U.S. $78 per barrel compared to U.S. $60 per barrel in the second quarter of 2009. The impact of the higher U.S. dollar WTI price in the second quarter of 2010 was offset somewhat by a stronger Canadian dollar, which averaged $0.97 U.S./Cdn for the second quarter of 2010 versus $0.86 U.S./Cdn for the second quarter of

Canadian Oil Sands Trust Second Quarter Report 2010 11 2009. Year-to-date, WTI averaged U.S. $78 per barrel in 2010 versus U.S. $52 per barrel in 2009 while the Canadian dollar averaged $0.97 U.S./Cdn in 2010 versus $0.83 U.S./Cdn in 2009.

The Trust’s SCO price is also affected by the premium or discount realized relative to Canadian dollar WTI (the “differential”). In the second quarter of 2010, the Trust realized a weighted-average SCO discount of $2.04 per barrel versus a $2.59 per barrel discount for the same period of 2009. The differential is dependent upon the supply and demand for SCO and, accordingly, can change quickly depending upon the short-term supply and demand dynamics in the market and pipeline availability for transporting crude oil.

The Trust’s second quarter sales volumes averaged 119,000 barrels per day and 76,000 barrels per day in 2010 and 2009, respectively. Year-to-date sales volumes averaged 109,000 barrels per day in 2010 versus an average of 89,000 barrels per day for the first half of 2009. Sales volumes for 2010 reflect the turnaround of the LC Finer and associated upgrading units, unplanned maintenance on a hydrotreater during the first quarter and unplanned repairs and maintenance on two diluent recovery units during the second quarter. By comparison, sale volumes for 2009 were impacted by the Coker 8-3 turnaround, circulation issues in Coker 8-1, reliability issues in mining and upgrading operations, and constrained bitumen production during the first quarter.

The Trust purchases crude oil from third parties to fulfill sales commitments with customers when there are shortfalls in Syncrude’s production and to facilitate certain transportation and tankage arrangements and operations. Sales revenue includes the sale of purchased crude oil. Increased crude oil purchases in 2010 reflect additional activities to support unanticipated production shortfalls due to the advancement of the LC Finer turnaround and incremental purchases associated with tankage arrangements, as well as higher crude oil prices as compared to 2009.

Operating Costs

The following table breaks down operating costs into their major components and shows bitumen costs both on a per barrel of bitumen and a per barrel of SCO produced basis. The information allocates costs to bitumen production and upgrading based on deductibility for bitumen royalty purposes. The Syncrude Royalty Amending Agreement provides for allowed bitumen costs, before internal fuel allocation, to be 64.5 per cent of Syncrude total operating costs until December 31, 2010.

Canadian Oil Sands Trust Second Quarter Report 2010 12