You can get a regular credit card from a major bank that offers cash back rewards on all purchases, including gas purchases. For example, it can be the Discover it® Chrome card. This card doesn’t require sign-ups and has no rotating rewards categories. You will simply earn cash back on all purchases. There is no annual fee and you will be able to take advantage of 0% intro APR on purchases. You can keep this card as your primary card, or use it for gas purchases only.
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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.