Investor Presentaiton

Crude Slate Transition at El Dorado Underway We Anticipate El Dorado's Crude Slate Will Be Weighted Toward WTI-linked Crude In Early 2013 El Dorado Has A Diverse Crude Slate Supplying More WTI-Linked Barrels Focus Is On First Half of 2013 Historically processed local Arkansas, domestic offshore and foreign crude oils Ability to displace expensive foreign and GC crudes with discounted local, inland crudes Targeting 80,000 bpd of non-Gulf Coast crude deliveries to El Dorado El Dorado Refinery Crude Slate (3012) (1) Receiving More WTI-Linked Barrels (BPD) (2) Midland Crude, 14% Rail, 24% Other Crude, 35% Local Crude, 27% Local Arkansas Crude WTI/WTS - Midland Rail Rail ~27k bpd 28k bpdˆ‍ ~28k bpd 35k bpd ~25k bpd ~25k bpd ~21k bpd 18k bpd T June-11 3Q11 4Q11 1Q12 2Q12 3Q12 1H13 (1) The El Dorado refinery's total throughput in October 2012 is in line with 3Q12 rates. (2) Includes local Arkansas barrels collected via the Company's 600 mile crude gathering system, in addition to west Texas crude oils delivered to the refinery 9

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