There have to be other ways to generate this power too. Already I see one manufacturer using the petrol/diesel to power an onboard generator only, and all the drive power is from the electric motor. There must also be a means to capture some solar power via a roof panel, and could those fine wires that deliver your heated window take power in the opposite direction from the window to a battery? Equally, on a two wheel drive car can the rotating action of the other wheelset power some form of generator to reclaim some of the spent power?