Most auto engines are 30+% efficient. Some of the new engine technologies bump that up as well. Like direct fuel injection and turbos.
Improving power efficiency, that's why most manufacturers are going to 6 speed autos or even CVTs to match road speed to engine efficiency better.
A heater that moves, good analogy.
If there were better batteries, the cell phone manufacturers would be all over it.
Yeah baby! A serial hybrid cell phone! I'm all over that!
I'll be right back.....