Pulling into a gas station right off the interstate or turnpike saves time, but it can cost you money. Gas prices just off the highway may be higher than at stations at discount stores and near supermarket shopping centers, says Jody DeVere, chief executive at AskPatty.com, an automotive advice and education site for women.
Warehouse stores, such as Sam's Club and Costco, also offer cheaper gas, but you have to be a member. If you are, check your route beforehand to see if there are any locations on the way.
Finally, smartphone users can download free apps, such as GasBuddy, to find stations closer to town that offer fuel at lower prices.