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.

Gas credit cards carry a higher interest rate and may not be accepted everywhere, they can help you build your credit if you use them responsibly