In forty years, the average Internal Combustion engines being produced will be 50% more efficient than the average IC engine is today.
Battery chargers? In a sense, that is pretty much what they are used for today - except for those rare jumper cable moments.
Forty years? In forty years, most owners of the twelve cylinder Ferrari will have joined the Commandetore in the afterlife. With or without the blessings of the Pope, the Kyoto Accord (a very efficient Japanese car, BTW), or Al Gore.