You want the engines and motors in your vehicles and machinery to last for as long as possible. However, the fuel that you use in them can compromise their function. It can cause you to have to repair them sooner than you would prefer. To ensure their longevity and usefulness, you can switch to using ethanol-free gas that you get from a reputable provider. 1. Better Mileage One of the main advantages that ethanol-free gas can offer to you involves better mileage.