a Few years ago there was a very boring sport going on of maxing fuel miles. I believe its possible, i think there were people out there getting close to 100mpg on there cars (not dsm related), they used like a tap method on the gas or something, it was weird I'll look it up. I've had 200miles on 3/4 tank before, but threw a combination of either inaccurate readings, or me going "wow this is a good tank, I guess I can afford to drive a bit more aggressively here" I've never gotten more than 400miles out of a tank, I'm normally in the 250 range on a tank.