The Energy Expended by a turning wheel

[fuga]

ok, so i am not exactly sure how to do the math required to figure this out, and you can make fun of me if you wish, but what is the energy expended by a turning wheel of a car, and could that energy be harnessed and stored, all while driving down the road?

 

[n.karthick]

I don't know math completely for finding energy to turn a wheel, but simply I can say that kinetic energy stored in a rotating wheel
E=1/2*J*w^2
where, J is moment of inertia of wheel, w is the angular velocity.
This is the energy,perhaps you have to impart to a standstill wheel to make it rotate at speed w, assuming no frictional and other losses.

 

[Averagesupernova]

You are already harnessing the energy by moving your car ahead. Any more energy taken will result in more fuel consumption. You won't be getting something for nothing.