Sure tell me the number of electric motors and their mass per car and generators alternators per car and the number of each type of car. Then the number of cars per year. I'm saying 10.8 million new autos in USA this year.

21 KG seems a bit high to me for non hybrid vehicles, but if you have motors on every window, seat, door lock, closers for certain doors, windshield wipers front back and headlights 9ala volvo) fan for air, and heat and radiator, and every vehicle is the size of a pick up truck i could get there.

FOr hybrids, I suspect you are in pretty fair shape. So my question back to you is, with your 21 kg estimate, how much copper per vehicle? How many pounds of lithium batteries?

milo