a tacoma, frontier, 4runner, or xterra averages 18mpg has a 22 gallon tank, max range 396 miles.
with the horseless carriage what are you going to do? You can't pull over and water and feed it to keep about your way, you have to find specific " filling station" and PAY for "fuel". I tell you, the automobile will never be anything more than a rich mans toy.Do you plug it into the nearest cactus to charge it? Perhaps a solar powered boulder? Get real people.