Have General Motors' hydrogen fuel-cell vehicles emitted enough water vapor over the past six-plus years to equal the steam coming out of Old Faithful? Not exactly, but GM has released a few figures related to the Project Driveway initiative it began in 2007. The numbers are impressive, if not quite of the geyser-spouting variety.
General Motors says one of its hydrogen fuel cell Chevrolet Equinox crossovers has driven enough miles to offset more than $18,000 worth of gasoline. Of course, fuel-cell vehicles cost quite a bit more than that to build and hydrogen fuel ain't free, but we'll go along with this. Specifically, GM is commemorating the fact that one of the fuel cell vehicles in its test fleet surpassed 100,000 miles, which the automaker estimates would've otherwise used 5,260 gallons of gas. At $3.50 a pop, that's