Search walmart's website for the towns you will be traveling to and through to see if there are any walmarts there that have gas stations. If they do, buy Walmart gift cards to use at their gas pumps. It will automatically save you 3 cents on every gallon. If you don't want to buy the cards ahead of time, when you find a walmart gas station, go into the store before getting the gas and buy your gift card on the spot then drive to the pumps to get your gas. We have an rv and in November, we saved $2.50 on one fill up by doing just that. Again, it may not seem like much, but it does add up. ... View related article.