Ford Motor Company unveiled on Tuesday the world's first drivable fuel cell hybrid electric vehicle with plug-in capability.

The vehicle, unveiled at Washington's Auto Show, combines an onboard hydrogen fuel cell generator with lithium-ion batteries to deliver more than 41 mpg with zero emissions, said the company.

The vehicle is built on a flexible powertrain architecture that will enable Ford to use new fuel and propulsion technologies as they develop without redesigning the vehicle, it said.

"This vehicle offers Ford the ultimate in flexibility in researching advanced propulsion technology," said Gerhard Schmidt, vice president of research and advanced engineering for Ford Motor Company. "We could take the fuel cell power system out and replace it with a down-sized diesel, gasoline engine or any other powertrain connected to a small electric generator to make electricity like the fuel cell does now."

The new HySeries Drive powertrain featured in a Ford Edge uses a real-world version of the powerplant envisioned in the Ford Airstream concept unveiled earlier this month at the 2007 North American International Auto Show in Detroit.

The HySeries Drive powertrain delivers a combined city/highway gasoline equivalent fuel economy rating of 41 mpg. For those who drive less than 50 miles each day, the average jumps to more than 80 mpg.

The plug-in hybrid is powered by a 336-volt lithium-ion battery pack at all times. The vehicle drives the first 25 miles each day on stored electricity alone, after which the fuel cell begins operating to keep the battery pack charged. This provides another 200 miles of range for a total of 225 miles with zero emissions.