Jim Fletcher, a mechanical engineering doctoral student in fuel cell technology, said the bus is 10 percent more efficient than comparable diesel buses -- a first step in what researchers expect will one day be a far more efficient form of transportation.

CNN: Bus showcases fuel cell technology

The Detroit News and Detroit Free Press both reported Friday that GM is moving the engineers -- who have been working on the fuel-cell technology in the company's advanced development laboratories division -- to the company's core production engineering division, which designs vehicles to be brought into production.

CNN: GM takes step toward fuel-cell car