what happens during the regenerative braking process with HEVs? Answer: The energy from the brakes is absorbed and distributed back into the battery to recharge inselfwhat is the tax deduction for this year if a person uses a HEV car? It depnds on the car but its somewhere between $1500 to $2400 depening on the carwhat are the benefits of Fuel cell vehicles going to be? Better MPG ratings, lower emissions, better for the economywhy aren't FCVs used in production line vehicles. The cost