Here's a tip on how to save money on gasoline:
Shop online: If you spend evenings or weekends running errands to various stores, consider ordering products online and let someone else pay for the gas.
That's doable if you can find free shipping online or lower product prices to compensate for shipping fees. Free shipping often comes in the form of a coupon code used at online checkout. Use a search engine with keywords "coupon code" and the retailer's name.