So you want a small or mini SUV and you’re not sure which one to buy. Read the manufacturers’ specifications, check out motoring writers on line and talk to other SUV owners. But you might begin by asking yourself some questions. After all the best mini SUV gas mileage will be found only if you have the vehicle you want. What do you want your SUV to do? Answer that then go and look for your new SUV. Remember too that what you want to do will have a serious impact on the mpg readings of your SUV. City driving will almost always give a lower reading than highway driving.