Mercedes-Benz is introducing a “research vehicle,” concept at the Geneva Motor Show next month that combines hydrogen fuel cells with plug-in hybrid.

That means the F800 Style can travel for 18 miles on electric power alone after being plugged in overnight -- and when it runs out of juice it can cruise for another 375 miles on hydrogen. The result: no emissions.
Since it's a concept and an automaker can hog-wild -- not that staid Mercedes would ever call it that -- the F800 has cool sliding rear doors and a sparse interior.
“We are dedicated to reconciling our responsibility for the environment with practical customer utility in a fascinating automobile,” says Thomas Weber, the Daimler Board of Management member responsible for R&D.
The plug-in hybrid power plant pairs big batteries with a V-6 engine capable of 300 horsepower, or 409 horsepower when the electric motors kick in.
For driving on fuel-cell power, Mercedes-Benz engineers somehow found a way to tuck that component under the hood with an electric motor near the rear axle and four hydrogen tanks, two of which are between the passengers.
(Source: USA Today)