>>What do you mean "self-sufficient"? They make their own fuel?!!!
>
>Oops, that was the wrong word. Self-contained, to a degree, but still dependent on an external source of fuel.
>
>>The idea of a car charging its own batteries whilst driving on fossil fuel, so it can run off those batteries seems attractive to me (if a tad perpetual motion?)
>
>Well, you still need to take on a tankful of fossil fuel occasionally to make more electricity to store in the batteries to run the motors that spin the wheels that make the car move (around the house that Jack built).

Ha Ha

You been listening to Gracie Fields wartime women in the factory song?:

...
It's a ticklish sort of job making a thing for a thingummybob
Especially when you don't know what it's for.
But it's the girl that makes the thing
That drills the hole that holds the spring
That works the thingummybob that makes the engine roar
But it's the girl that makes the thing
That holds the oil that oils the ring
That makes the thingummybob that's going to win the war.
...