As gas prices rise, credit cards can help consumers save money on gas, but choose wisely. Co-branded gas cards, often affiliated with specific brands, offer discounts on fuel bought at specific stations. However, these cards require a paid membership to the wholesaler or warehouse club, which typically requires a membership fee. NerdWallet recommends a general rewards credit card that earns at least 3% cash back per $1 spent on gas purchases, not just with one specific brand. Other money-saving tools include card-linked offers, grocery rewards, and gas station loyalty programs. Some gas companies have free membership programs, usually with a cents-per-gallon discount.