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What kinds of companies use our services? A large, diverse and growing number of organizations throughout the country, including: Cenex Harvest States Cooperatives Center Oil Citgo Petroleum ConocoPhillips Corporation Countrymark Petroleum Delek Refining Enterprise Products Corporation ExxonMobile Corporation Flint Hills Resources/Koch Petroleum/Invista Flying J Corporation Frontier Refining Giant Refining Hess Corporation Holly Corporation Hunt Petroleum IAG Corporation KBC Advanced Technologies Marathon Petroleum Middough Corporation Murphy Oil Corporation National Cooperative Refiners Association Paramount Petroleum Purvin and Gertz RaceTrac Petroleum Sunoco Logistics/Refining/Marketing Tesoro Petroleum United Refining URS Corporation Valero Energy Wawa
