Originally Posted by
iahphx
For those going to Royal Farms, what I tend to do is walk into the store and buy gift cards $30 at a time on my different AMEX cards (they let you load whatever you want). That way, you don't have to buy exactly $30 in gas to maximize the deal.
even without any other promotions, i do this at gas stations that charge more to use your credit card. go inside, buy a gift card with credit card, pay cash price at the pump with gift card.
when discover/chase is running a 5% cashback on gas promo, i've never had this "trick" code anything other than a gas purchase.