> Mass transit is full of big heavy vehicles running mostly empty on off-peak hours. It's more efficient only at rush hour. I'd expect net efficiency over the full usage is worse, compared to electric cars.

That is really only true in the states right? In other countries with decent mass transit systems, it seems like they are really full during rush hour but only mostly full at other times, utilization is very good. American systems seem to be dysfunctional...probably because cars are more convenient for off peak travel. I can see how door-to-door automated vans or even taxis could fill in off peak travel here, while the big vehicles serve mostly peak demand (in the states, elsewhere it isn't as needed).