Saving money on gas is always helpful when traveling. In particular, if you are taking a long road trip, being able to save on a travel expense is nice. In the past, I have had good experiences using online gift card re-sellers in order to save on gift cards that rarely go on sale. Today, CardCash is offering a 3% discount on Exxon Mobil gas cards. You can check to see if they have any locations near you.