Best Gasoline Cashback Credit Cards
Getting a good gas cashback credit card is the easiest way to save on gas, bar none. With gasoline prices increasing every single day, everyone is looking for ways to save on driving. Since you probably can’t sell your car and get one of these highest mileage cars, the next easiest thing is to get a credit card that gives you a little extra cashback on gasoline purchases. At the moment, besides specific gas station branded credit cards, I think the two best options out there is an American Express card and a Discover card.
The best option right now has to be the American Express SimplyCash® card because it offers 3% cash back on gas, office supplies, and wireless services and it credits the cash back automatically on your statement. You don’t have to request or wait for a check, you don’t have to find out what reward you want, everything is credited automatically (totally hands off cashback system FTW!). That’s a 3% discount off your gas with no catches, no gimmicks, no BS. The tricky part is that it’s a business card but anyone can apply for a business card. This is the land of opportunity and anyone can hang out their shingle, so enter your Social Security number as your Federal Tax ID and you’re golden (you’re technically a sole proprietorship, there are no additional tax forms to fill out to identify yourself as a sole prop and this is perfectly legal, check with a legal or tax professional and they will confirm this). I don’t know the criteria for approval so it’s just you and your credit score from here.
Other salient details of the card are that there is no annual fee (I won’t recommend a card with an annual fee unless there is a compelling reason) and they have a 0% introductory APR on purchases for up to 12 months. The card also gives 1% cashback on all other purchases and offers all the features and benefits of American Express’ OPEN network.
A close #2 is the card my wife and I use, the Discover® Open Road(SM) Card. The Discover Open Road card is a consumer card, so you don’t have to play business owner, and it offers 5% cashback on both gas and auto maintenance purchases. Whereas the AMEX card only gave you 5% on gas (and other business-like services), this one includes auto maintenance. Unfortunately, the 5% cashback bonus is only on the first $100 of gas and auto maintenance purchases a month! (Thanks Joe!). This makes the AMEX card a much better card. However, one additional perk of Discover is that you can get anywhere from 5% to 20% cashback bonus when you redeem your cashback in the form of a gift card from one of their retail partners. I used to get double cashback when I sold stuff on eBay because I’d convert my cashback for gift cheques to various stores I frequented. This card also has no annual fee and does offer a promotional 0% APY balance transfer until June 2009. This the card my wife and I currently use for gasoline purchases, but given the new limitation we’ll probably look for another one.
Update: How could I forget the awesomeness that is the Costco TrueEarnings card? If you get the Costco TrueEarnings Business card, you get 5% cashback on already cheap gas prices; if you get the Costco TrueEarnings regular card, you get 3% cashback on already cheap gas prices. You also get 3% back at restaurants and 1% back on everything else. The only downside is that there’s an “annual fee” in the sense that you have to be a Costco member ($50 annual membership).
Beyond that, you have a few cards that give gimmicky 12 month promotional cashback offers or are specific to a particular gas station company. I am never a fan of the limited time promotions unless the offer is especially juicy and I don’t want to be tied to a particular gas station, I like freedom.
What gasoline card do you use?

Is it me or have many of the 5% cash back credit cards begun to scale back their promotional offers? First, 

