tay
Enlightened
many people have thought of similar ideas.... the problem is anything that generates electricity takes power to do so and by putting the fan on to generate power you will slow the car down and to keep the speed up you would have to burn more fuel and since the fan isn't 100% effiecient you cannot even break even on this and lose energy to friction (air turbulence etc).
Well, all you have to do is pop the clutch to get it moving.