Education and Communications What company supplies gas to 7 11? What company supplies gas to 7 11? Marathon Petroleum Where does 7/11 buy their gas? Years ago, Venezuela-based petroleum company Citgo used to supply gas to 7-Eleven, but 7-Eleven cut ties due to the country's leadership at the time, Hugo Chávez. 7-Eleven has supplied its own gas ever since.2020-07-17 Related Posts: