Thirteenth Annual Global High Yield Conference September 2005

1 Forward Looking Statements This presentation contains forward-looking statements that involve known and unknown risks and uncertainties. Forward-looking statements are identified by words or phrases such as “believes,” “expects,” “anticipates,” “estimates,” “should,” “could,” “plans,” “intends,” ”will,” variations of such words and phrases, and other similar expressions. While these forward-looking statements are made in good faith, and reflect the Company’s current judgment regarding such matters, actual results could vary materially from the forward-looking statements. Important factors that could cause actual results to differ from forward-looking statements include, the risk that the pipeline acquisition and the acquisition of Dial Oil Company will not result in additional growth or increased profitability for our Four Corners operations, the risk that it will not be possible to place the acquired pipeline system in operation and/or operate the Bloomfield and Ciniza refineries at maximum rates due to financial, operational or other constraints, the risk that the timetable for placing the pipeline system into operation will be different than anticipated, the risk that it will not be possible to obtain additional crude oil for processing at the Bloomfield and Ciniza refineries at cost effective prices, the risk that the operations of Dial Oil Company will not complement our existing wholesale and retail businesses, the risk that the combination of the operations of Dial Oil Company with the operations or Phoenix Fuel will not provide a platform for future growth, the risk that we will not be able to obtain a larger credit facility should we want it, the risk that refining fundamentals will not remain more positive than the same time last year, the risk that our retail group will not continue to see fuel volumes and merchandise sales above last year’s levels, the risk that Phoenix Fuel will not continue to see stronger margins than last year or volumes consistent with the same time last year,, and other risks detailed from time to time in the Company’s filings with the Securities and Exchange Commission. All subsequent written and oral forward-looking statements attributable to the Company, or persons acting on behalf of the Company, are expressly qualified in their entirety by the foregoing. Forward-looking statements made by the Company represent its judgment on the dates such statements are made. The Company assumes no obligation to update any forward- looking statements to reflect new or changed events or circumstance.

2 Company Overview  80% of EBITDA (a)  3 refineries (104,500 mbpd (b) )  2 terminals  Crude gathering pipeline system  Truck transports  11% of EBITDA (a)  124 convenience stores located in NM, AZ, CO (c)  9% of EBITDA (a)  One of the largest wholesale distributors in Arizona  Distribution plants  Unmanned fleet fueling locations  Delivery trucks Refining Group (a)2004 EBITDA, before corporate overhead and discontinued operations. See appendix for explanatory note and reconciliation. (b)Total combined refining capacity. (c)As of June 30, Phoenix Fuel Retail Group

3  Strong refining margin environment and positive long-term trends  Diversified operations and geographic markets  Proven ability to optimize operations and grow earnings  Long-term crude supply agreement for Yorktown enhances earnings and mitigates risks  Improved balance sheet  Additional growth opportunities Key Investment Considerations

4 Grow the Business  Refining Growth Evaluate divestitures from larger competitors Consolidation of smaller independents Evaluate refinery projects on ROCE  Retail Growth Increase market share in current markets Enter new refinery markets  Phoenix Fuel Capitalize on supply economics and technology to expand market share Identify acquisition opportunities to expand geographic area (Dial Oil Co.) Giant Strategic Objectives Maximize ROCE Grow the Business Achieve & Maintain Strong Capital Structure

5  Optimize operations, costs and capital spending  Identify strategic partners to improve costs and earnings  Increase crude supply to Four Corners refineries (Pipeline Acquisition)  Continue to increase merchandise and fuel sales in retail group  Continue to increase wholesale, cardlock and lubricant market share Maximize Return on Capital Employed Giant Strategic Objectives Maximize ROCE Grow the Business Achieve & Maintain Strong Capital Structure

6 Maintain Strong Capital Structure  Focus on continued debt reduction  Utilize free cash flow for debt repayment  Maintain capital discipline Strict capital planning for capital expenditure requirements Cost effectively manage operating and overhead costs Balanced acquisition financing Giant Strategic Objectives Maximize ROCE Grow the Business Achieve & Maintain Strong Capital Structure

7 Significant Recent Debt Reduction  Giant has been disciplined about debt reduction Debt to capitalization ratio reduced from 77% to 50% Approximately $175MM of debt reduction since June 30, 2002 Balance Sheet ($MM) 6/30/20026/30/2005 Cash$11.6$59.9 Debt Revolving Credit Facility$60.0$0.0 11% Senior Sub Notes$194.2$ % Senior Sub Notes$150.0$0.0 8 % Senior Sub Notes$147.6 Term Loan$38.9$0.0 Capital Leases$6.8$0.0 Total Debt$449.9$274.6 Shareholders’ Equity$132.3$270.9 Debt / Book Cap77%50%

8 Continuing Debt Reduction Balance Sheet ($MM) 6/30/2005AdjustmentsPro Forma 6/30/2005 Cash$59.9$72.2 Acquisitions($40.0) Equity Proceeds$52.3 Debt Revolving Credit Facility$0.0 11% Senior Sub Notes$ % Senior Sub Notes$0.0 8 % Senior Sub Notes$147.6 Total Debt$274.6 Shareholders’ Equity$270.9$52.3$323.2 Debt / Book Cap50.3%45.9% Net Debt /Net Book Cap44.2%38.5%

9  Giant made significant progress restoring financial flexibility and improving operating performance EBITDA ($MM) (a) Strong Financial Performance Cash Flow ($MM) (a) (a)See appendix for explanatory note and reconciliation. (b)Excludes acquisitions, asset sales and insurance settlements. (b)

10 Giant Industries: An Attractive Investment Opportunity  Strong industry fundamentals  Increasing mid-cycle margins  Strong operating performance  Increased operating flexibility  Positive impact from high-acid crude agreement and refinancing transactions Maximize ROCE Grow the Business Achieve & Maintain Strong Capital Structure  Significant leverage reduction  Improved float & liquidity  Valuation discount to independent refining peers  New flexibility to pursue growth opportunities  Diversified lines of business  Experienced management  Growth opportunities across all business segments

11 EBITDA Reconciliation EBITDA represents income before interest expense, interest income, income tax, and depreciation and amortization. EBITDA is not a calculation based upon generally accepted accounting principles; however, the amounts included in the EBITDA calculation are derived from amounts included in the consolidated financial statements of the Company. EBITDA should not be considered as an alternative to net income or operating income, as an indication of operating performance of the Company or as an alternative to operating cash flow as a measure of liquidity. EBITDA is not necessarily comparable to similarly titled measures of other companies. Consolidated EBITDA ($MM)Segment EBITDA ($MM) (a) (a)Prior to corporate overhead allocation. Segment EBITDAs do not add to consolidated total due to overheads and other reconciling items. Excludes discontinued operations.

12 EBIT Definition and Cash Flow Reconciliation EBIT represents income before interest expense, interest income and income tax. EBIT is not a calculation based upon generally accepted accounting principles; however, the amounts included in the EBIT calculation are derived from amounts included in the consolidated financial statements of the Company. EBIT should not be considered as an indication of operating performance of the Company or as an alternative to operating cash flow as a measure of liquidity. EBIT is not necessarily comparable to similarly titled measures of other companies. Cash flow is defined as cash flow from operations less capital expenditures. Cash flow is not a calculation based upon generally accepted accounting principles; however, the amounts included in the cash flow calculation are derived from amounts included in the consolidated financial statements of the Company. Cash flow should not be considered as an indication of liquidity of the company or as an alternative to cash flow from operations as a measure of liquidity. Cash flow is not necessarily comparable to similarly titled measures of other companies.