Just in case anyone thought General Motors was letting the air out of its hydrogen-powered vehicle efforts, the automaker put the public on notice this week that it remains as committed as ever to using its rolling science projects as a test bed for getting real world, mass-produced, hydrogen fuel cell vehicles in consumer driveways.If you've been following GM's fuel cell efforts at all, then you've no doubt heard of Project Driveway, a real-world test that began in late 2007 with the automaker deploying a fleet of 119 specially outfitted Chevrolet Equinox vehicles with a hydrogen fuel cell stack providing the juice for its electric propulsion. Drivers have logged more than 1.3 million miles in all around the world during the test, and even got in a few accidents (no, nothing blew up). For a complete breakdown on the present fuel cell Equinox and what it was like to drive, be sure to check out MT technical editor Kim Reynolds excellent take on the vehicle.