I guess you keep your 1/1 if you get this combo set up. But yeah it's a 1/1 that's easily killed by a bunch of random cantrips so unless you're gonna give it haste as well it's a pretty bad combo
Unless you drive a much bigger car than you need to (i.e. that guy who drives a ford 350 to the office), there's probably not much to save on engine efficiency. Maybe a liter/100km
Still need batteries big enough to power global shipping etc. Nuclear can do that, even though building reactors takes time