I am not an engineer or an electronic specialist but I wonder why we cannot use the air pressure in front of the car through a duct in the bonnet to drive an alternator to produce electricity to re charge the battery while we drive. This would need to know the ammount of energy used to decide the capacity of the alternator and it's production of energy.
A rotating drum with helical vanes inside a tube with the shaft of the drum driving the alterntor could be worth looking at.
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