@Yodrak
Just "double-check(ing you on your) math", I think you flipped your units:
> - Leaf requires 2,500 Btu/mile of fuel
> - gasoline has 125,000 Btu/gal
> (http://en.wikipedia.org/wiki/Fuel_effic ... nt_of_fuel)
> - Leaf requires the equivalent of 50 gallons of gasoline per mile...