JtS and I buy most of our gas from Citgo. From their "about" page...

http://www.citgo.com/AboutCITGO.jsp

"Based in Houston, Texas, CITGO is a refiner and marketer of transportation fuels, lubricants, petrochemicals and other industrial products. In addition to these products, there's probably a CITGO in your neighborhood, a convenient place to fill up with gas and grab a quick snack.

The company is owned by PDV America, Inc., an indirect, wholly owned subsidiary of Petróleos de Venezuela, S.A., the national oil company of the Bolivarian Republic of Venezuela.

Since 1985, CITGO has sold its various products through independent marketers. Our relationship with these people is really what makes CITGO different from other petroleum companies."