It probably only works if you have an AMEX Platinum card and signed up for the free Walmart+ membership, but look to see if you and your additional cardholders are targeted for 2x $10 off $40 at Walmart.com. You can buy Walmart gift cards that -- thanks to a new partnership -- you should be able to use at Exxon stations. It works out to be a little more than a dollar a gallon savings, and you also get an additional 10 cents off a gallon from Walmart+. Makes me feel better than paying full price.
