I also go to places where I can get discount on gas. Walmart offers 3 cents off if you use a Walmart gift card. The same goes for Kroger and Tom Thumb.
Kroger and Tom Thumb offer more off per gallon depending on how much you spend at the store. One good way to earn extra points it to buy gift cards from the store for places you plan on going to. For instance, if you're planning on going to Red Lobster or Outback for dinner... stop by Kroger and see if they have gift cards for those restaurants. They usually have them in $25 gift cards. Since you bought it at Kroger, you get points added to your Kroger card. When you have enough points within a month, you can get 10 cents up to 2 dollars off a gallon!