Investor Presentaiton

WTI Midland vs. WTI Cushing Differential Between Midland and Cushing Sourced WTI $0.00 1Q11 2Q11 ($1.00) 3Q11 4Q11 1Q12 ($2.00) 2Q12 3Q12 4Q12 ($3.00) ($4.00) ($5.00) ($6.00) ($7.00) ($8.00) Jan-11 Feb-11 Mar-11 Apr-11 (1) Source: Argus May-11 Jun-11 Jul-11 Aug-11 Sep-11 Oct-11 Nov-11 Dec-11 Jan-12 Feb-12 Mar-12 Apr-12 May-12 Jun-12 Jul-12 Aug-12 Sep-12 Oct-12 Nov-12 Dec-12 20 20

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