If supposing we were to add a wind turbine connected to a generator to a moving car, would we be able to get the air flowing around the car to turn the turbine and therefore gain some energy? If it is possible, is it economical? if it is, is it practical? would there be a loss? would there be any gain in overall efficiency?? A friend of mine wants to do this project for collage and wants to implement this idea... I just want to know if it is practical or not... So... what do you guys think?