[FattyBoomBatty]

skinnier tires that are properly inflated (check yours anyway). You can also add aero mods like flat underbody panels and a lower air dam (an add on, not a whole new bumper).

A really helpful thing to do is simply slow down. Don't accelerate so fast and cruise at a lower speed. 55mph save an assload of gas. I remember a year ago when I drove behind my cousin's truck in my quest. he was pulling a trailer and wouldn't go over 60. I was dying cause it was taking so long, but it took less than half a 20 gallon tank to drive to fargo, where it would normally take almost 3/4 tank. the difference between 80 and 60mph is huge for milage.