Ah. From what I understand the 6g is smaller, lighter, has less rotational inertia, and outputs the same power, for a similar price as the 3g. I figured everybody would be doing 6g nowadays. lolSince the car isn't going to have A/C, heater, stereo or anything else like power windows I didn't see a need for a 6g. The only auxiliary thing the car is going to need to run is the electric fan.