...probably a Turbo, with some humongous spoiler-contraption on the back, to provide wind-shadow to a bicyclist following the car. Probably set some speed record, back about 15-20 years ago.

If you design your wind-shadow thingy correctly, couldn't you induce a vortex that actually *sucks* the bike along with the car (or train, truck, or whatever), without the need to tread the pedals at all -- just coasting along?