content: You end up building your own hybrid in a zombie situation put a gas/diesel generator in the trunk take off the trunk lid and drive until you are at 1/4 then start generator and drive till full then turn off generator and repeat.  The bigger boxy self driving room you sit in layout works for electric as you could have the roof be all solar to help with that during the day and the larger flat top layout complements solar panels. That is what I want for a self driving car, the room thing electric or not matters less, I can go to bed in it on friday after work sleep for 8-10 hours get up 3 states away and have a Saturday crash in a hotel Saturday night spend most of Sunday there and then the car drives me back that night while I sleep get home shower and go to work. A full 2 days anywhere within 8 hours drive of home on a normal weekend. Road trips would be very different if you could spend a full day then travel all night to the next location an just need to find showers along the way, Imagine spending a 10 day vacation and every day could be a different location up to 8 hours apart no long drive making you tired as that happens while you are sleeping, get stuck in construction who cares you set your alarm by GPS instead of time.