Mountain living

What about hilly terrain someone asked? Could the pedal car have an engine like a wind-up toy so that the pedals weren't actually moving the car but winding it up? How about combining with wind power? What if you mounted a couple windmills on the front of the car enclosed in a grate? Would the air blowing on the car while driving operate the blades and charge a battery perhaps to run the car's electrical systems? I don't know, what you think?