Ya good idea on sticking with the small car plan. Toys are toys. We spend money on them to make them the way we want them, but as soon as you try and get it to do something you didn't modify it to do, you are wasting your time and money. My old Vette would probably get decent MPG, but I wouldn't try to do that with it, that's not what I intended it for. Get an eco friendly ride and have fun modding it for more MPGs, then have your modded 4x4 toy for going wheeling. Problem solved lol.