I make less unneccesary trips and try to combine errands with places I need to go. Like Tiesdays, my DD has Theater group so I just try to wait until then to do whatever running around I need to do and then wait in the parking lot for her to be finished instead of going home and then returning.
I also am buying all of my groceries at a local store that is offering 'fuel perks' program, it's 10 cents off every gallon of gas (up to 30 gallons) per $50 spent in the store. So, if you buy $165.00 in groceries, your fuel perk balance is 30 cents off and you have $15 towards the next dime level. They keep accumulating until you redeem them.
I have to buy groceries anyways. Also, you can buy gift cards there too and get those amounts applied to your fuel perk balance, like for restaurants and retail stores, etc. So, I do buy those too if I am planning on shopping at those places. We wait until the fuel perks balance is at least over above $2 and then fill up. It's not much, but has saved us.