Regarding the 6% transmission costs, if you have 17 charged batteries and use 1 of them to power a self-driving vehicle with negligible maintenance costs (and i

Regarding the 6% transmission costs, if you have 17 charged batteries and use 1 of them to power a self-driving vehicle with negligible maintenance costs (and in a future where all vehicles are electric), it would make sense to haul the other 16 within whatever distance the vehicle can manage on a charge. It looks like a Tesla S battery pack is a little over 1,200 lbs. So for a rough estimate, consider the distance a Tesla S can tow 20,000 lbs. Probably not very far. Unless I botched my reasoning somewhere, it looks like battery energy densities would have to increase by an order of magnitude or two for this to become a thing.