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® Cash Back 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.
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All rates and fees, and other terms and conditions of the products mentioned in this article/post are actual as of the last update date but are subject to change. See the current products' Terms & Conditions on the issuing banks' websites.