lol that would be kool to have vex drive a car or snow plile or a tractor lol that would make my life easy lol:D 
think if cops were chaesing u and thay look in the car and no 1 was thair lol
If you were feeling Croesean you might try some kind of small fuel cell. But one which would generate enough power for the VEX would probably set you back a grand or more.
~ Christopher
maybe go to solar power:)
next up is hydropower, although i dont know how well that would work…