in the united states, many 7-eleven locations used to have filling stations with gasoline distributed by citgo, which in 1983 was purchased by southland corporation (50% of citgo was subsequently sold in 1986 to petróleos de venezuela, s.a., with the remaining 50% acquired in 1990). although citgo was the predominant partner of 7-eleven, other oil companies are also co-branded with 7-eleven, including fina, exxon, gulf, marathon, bp, shell, chevron (some former tetco convenience stores were co-branded with chevron, and texaco prior to the 7-eleven purchase in late 2012), and pennzoil. alon usa is the largest 7-eleven licensee in north america.