will the hydrogen fuel cell vehicle ever hit mainstream? if so, when will they become commercially available?

is a concerted effort being made to push through development of a car that emits WATER as it's waste product? Wouldn't this solve alot of problems if it were widely used? how stable is using hydrogen as a fuel source? I keep seeing glimpses of commercials and reading snipets of info on such a vehicle, but do you think it will ever become a functional reality?

Is hydrogen fuel-injection more potent than hydrogen fuel cell?

What is the energy difference (energy output) in hydrogen burning in a fuel injection (combustion) engine and hydrogen used in producing electricity in hydrogen fuel cells? Gasoline power is stronger.

BMW has made a hydrogen fuel-injection based car, meaning this is not a hydrogen fuel cell, but the same engine used for burning gasoline, but now it burns hydrogen instead. The car is found here.

http://www.cars.com/go/features/autoshows/vehicle.jsp?vehicletype=concept&autoshowyear=2007&vehicle=concept_bmw_7hydrogen&make=BMW&model=Hydrogen+7+Prototype

What I am wondering is, that if hydrogen gas when burned is the same potent as gasoline, then shouldn't a fuel injection engine be more powerful than a fuel-cell electric engine? My particular interest if the two are different energies (battery cell vs. hydrogen combustion). If hydrogen combustion produces more horsepowers, then that extra energy could theoretically make up for the 30-40 percent energy loss in making hydrogen.

Toyota vs…Toyota? Camry Hybrid takes on the Prius

LEARN MORE ABOUT TOYOTA HYBRIDS:
http://www.edmunds.com/insideline/do/Drives/Comparos/articleId=127826

Guy walks into a Toyota dealer — sounds like a joke so far, right? Not quite.

Guy walks into a Toyota dealer looking for a 2008 Toyota Prius. He’s heard about hybrids for awhile now, and the Prius is one he knows by name. He vaguely recalls some celebrity bragging about taking one to the Academy Awards instead of a limo, and then there was that South Park episode, “Smug Alert” a couple of years back. And didn’t Al Gore’s own son make headlines for getting busted doing 100 mph in his Prius?

Something like that. Beyond the hype, Guy’s never really given hybrid cars much thought, much less gone looking for one. And even though he can afford a decent-size car or SUV, the price of gasoline has him looking for fuel economy in a serious way.

And there on the showroom floor, Guy sees a 2008 Toyota Camry Hybrid for almost the same amount of money as a Prius. Now what?