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Cost Classifications

3 Months Ended

Mar. 31, 2012

(7) Cost Classifications

Cost of product sold (exclusive of depreciation and amortization) includes cost of crude oil, other feedstocks, blendstocks, pet coke expense and freight and distribution expenses. Cost of product sold excludes depreciation and amortization of approximately $0.7 million and $0.6 million for the three months ended March 31, 2012 and 2011, respectively.

Direct operating expenses (exclusive of depreciation and amortization) includes direct costs of labor, maintenance and services, energy and utility costs, property taxes, environmental compliance costs, as well as chemicals and catalysts and other direct operating expenses. Direct operating expenses exclude depreciation and amortization of approximately $30.8 million and $20.9 million for the three months ended March 31, 2012 and 2011, respectively.

Selling, general and administrative expenses (exclusive of depreciation and amortization) consist primarily of legal expenses, treasury, accounting, marketing, human resources and costs associated with maintaining the corporate and administrative office in Texas and the administrative office in Kansas and Oklahoma. Selling, general and administrative expenses exclude depreciation and amortization of approximately $0.6 million and $0.5 million for the three months ended March 31, 2012 and 2011, respectively.