The "F" class is just concepts. quoting MB website:
Quote:
The letter "F" has a special significance in Stuttgart. It stands for the German ‘Forschung’ or ‘Research’. And it is a short step from ‘research’ to ‘future’. In 1991 it was the F 100 Technology Car which pointed the way forward. Then in 1996 came the F 200 Imagination, a coupé equipped with technical systems which will make their debut in the top-of-the-range models of tomorrow.
But looking at the latest research vehicle from Daimler-Benz, the letter ‘F’ could just as well stand for ‘fun’ . Or ‘fascination’. The F 300 Life-Jet ex-udes all these qualities, coupled with others like dynamism and vitality. And it lives up to this promise when it takes to the road, thanks to a unique vehicle concept and an intelligent axle control system.
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BTW, the F300 Lifejet is this odd little fellow:

I think it looks cool