Super efficient, yes. But, the car is so "advanced" that it will probably do what it wants to before it will do what you want it to do - like turn itself off.

I would give up 1/2 of the fuel effiency for a less dorky look. And man, is it dorky looking.

I think the front crumple zone is somewhere between your foot to head area, and it will probably take half the trip to get up to speed. But, it is an incredible achievement.