Yes, The Pantry/Kangaroo does get gasoline from Citgo.

According to Hoover's Company Records (accessed through LexisNexis), and last filed September 1, 2009:

"The company currently receives about two-thirds of its gasoline supply from CITGO (who also supplies the company's private label Kangaroo brand), Chevron, BP, and ExxonMobil."

Citgo is not solely owned by Hugo Chavez, but by Petróleos de Venezuela, the national oil company of Venezuela (since 1990). It was formerly an American owned oil company and still employs 4,000 Americans in Houston. (From Snopes.com, last updated April 8, 2009.)