Hello, For a little project I'm doing for fun, I want to know what kind of mileage would be realistic for a light, minimalistic lunar-rover type vehicle that seats six. Using Wiki, I've found the energy density per kg of methane at 1 bar at 15*C. Unable to find it for liquid methane (my fuel of choice), I've just decided I don't need very much precision (just getting a ballpark sort of estimate), so that would do, and I ignored the loss of energy density from the gas to liquid phase, and from there I've figured that liquid methane has ~70% the energy density as liquid gasoline per volume. First question; is that going to be a huge error, or just a small one? But the next step has me stumped; how would the lower gravity effect mileage? Would it be proportionally greater, something more complicated, or make no difference?