A credit card with gas rewards that is offered by major bank will be a good option for you. Since gas purchases will not be the only charges to your credit card we would recommend you to skip co-branded credit cards and look for bank offers. Some credit cards give more points for gas purchases and less for other purchases. For example, the Discover it Cashback Match will let you earn up to 5% cash back on fuel during its rotating category quarter and and offers 1% cash back on all others purchases. Note that this card comes with no annual fee, so you can earn more using this card.