The Department of Energy does not collect data on the source of gasoline sold at gas stations. However, they do provide a Primer on Gasoline Sources and Markets that explains why this is difficult to determine.

A fuel card or fleet card is used as a payment card most commonly for gasoline, diesel, and other fuels at gas stations. Fleet cards can also be used to pay for vehicle maintenance and expenses at the discretion of the fleet owner or manager.

Blue Cash Preferred,Discover it,Chase Freedom,Citi ThankYou are a few best gas credit cards. Gas cards generally are issued in two versions: gas-only branded cards, which can be used at that station, or co-branded cards that are a Visa or MasterCard and can be used almost anywhere. Like retail-store cards, gas cards typically carry low credit limit