Oh I'm going to enjoy playing with this theme
Now, which of my 3 cars shall I use?

The 'project' in the back garden?
Still on three wheels, with dented safety cell and rusty chassis?

The 'leakster' in the drive?
5 years old and 122000 miles, but has more of a carbon slick than a footprint

The city car?
My new toy, still trying it out for economy - 67mpg so far.

Or maybe some race cars