> Isn't it. You drive, you burn fuel. I'd refer you to the Rocket Equation [1]. 1. http://en.wikipedia.org/wiki/Tsiolkovsky_rocket_equation http://en.wikipedi

> Isn't it. You drive, you burn fuel. I'd refer you to the Rocket Equation [1]. 1. http://en.wikipedia.org/wiki/Tsiolkovsky_rocket_equation http://en.wikipedia.org/wiki/Tsiolkovsky_rocket_equation