Join A Gas Club
I've known several families that joined gas clubs for a variety of reasons. One, they get discount prices, and two, they often provide "rewards". For example, for every dollar amount that you spend on gas you can earn gift cards for groceries or airline miles. Do a little research and find out which ones will offer you the best deals.
Balance Your Tires
If you are driving with unbalanced tires, it can actually wreck more havoc than you realize. Including using up more gas! Check with a local mechanic to see how your tires are faring.
Fill Up Mid-Week
Instead of filling up on the weekend when gas prices are often at the highest, try to fill up mid-week!
Avoid Holiday Hike Up
It's not secret that gas usually sky rockets during the holidays, so be prepared beforehand. Fill up before the date gets closer and consider storing up gas in gas cans if you can safely do so.
What tips have you learned that has helped stretch your gas budget?