Whenever I've booked a fly drive I've always upgraded the car at the pick up point. The agents normally show you a picture of a tiny 2 door car and say thats what's included in the fly drive, and offer you the next size car for a reasonable cost.

Whenever I go to collect my upgraded car the tiny 2 doors cars are no where to be seen, so my question is do these cars actually exist?

Do the rental companies just try to get you to upgrade knowing full well that they don't have the really small cars available anyway?