Sinclair credit card is a co-branded gas station credit card and is accepted only at Sinclair gas stations, so you will receive gas savings only there. If you want to save on your gas purchases and want to have a credit card that can be used at any gas station, consider general gas rewards credit cards. For example, the Discover it® Cash Back credit card comes with up to 5% cash back at different places each quarter like gas stations, grocery stores, restaurants, Amazon.com and more up to the quarterly maximum each time you activate. All other purchases earn 1% cash back. You can redeem earned cash back any amount, any time. Rewards never expire. What is more, this credit card has no annual fee.