Many Years ago....Service Station Credit Cards were the thing to have/use for fuel purchases.
Dad had a Texaco, Shell and Conoco
NOW ---any Visa, Mastercard, Discovery etc CC can be used and get CASH BACK
Easy-peasy ---no need to try find a specific service station just to use their CC
Pull up, pay will Cash Back CC, fill up and continue trip.
1 CC is set up for 3% Cash Back on Fuel
1 CC is set up for 3% Cash Back on Grocery
1 CC is set up for 3% Cash Back for On-line purchases
2 other CCs are set up for all around use....just as backups