Time Your Purchases
At any time, the price of a gallon of gas can vary by as much as 20 cents within a metropolitan area, says Brad Proctor, founder of GasPriceWatch, a consumer-advocacy website. To get the best bargain, avoid buying gas on weekends, when most people travel or run errands and gas stations raise prices accordingly. Also, stay away from stations on toll highways, which charge high prices to their captive customers. If you can stick to pumping once a week, says Proctor, you can often find the best prices on Tuesdays.