Yeah I saw that on the news the other night...I'm just skeptical. I know several people with Prius' who continuously state that they are getting 60+ on the highway. I actually challenged a coworker a few months back vs. my TDi Jetta on a trip to Seattle. I averaged 65mpg while he averaged 44mpg. Fact is that there are alot of green attitudes out there that are simply misleading/false/outright falacious. Heck, the number one green marketing tool in the US is the "flex fuel" fad. "flex fuel" (ie: ethanol) costs more for less...less mpg/hp for an expensive "upcharge" at the dealership to make consumers feel green. I'd like to think they are educated consumers, but obviously not. Unfortunately people lie about thier profits all the time (ie: bank accounts, the latest deal they got, the mpg's such and such gained them, etc). As much as we are pessimistic as a society we are optimists when it comes to hope for ourselves...and if we dont get 40 mpg's out of a $700+ conversion, well...we'll just lie about it, and live with it.
The one thing I do remember about hydrogen energy extraction was that it took nearly as much energy to harvest as it rendered in results. I mean, a rig with the drag coefficient of a tractor-truck is simply not going to get 40-50 mpg. You'd be hooking up the regional grid to expel enough energy to power your car...now consider the coal that was burned to do so (another fault of plu-in electric cars is the "hidden" contaminants of home electricity).
Are we talking cheap transportation or environmental transportation?
I'd love it to be true, but with the plummeting economy we are bound to see much more snake-oils being conned off by "wheeler-dealers" out to scam $$$ from desperate people. Me, I'll ride my bike more often (cuts down on my other energy storage), and dedicate my Cruiser to mountain mud-whore status.
Really, I'm just trying to add to the discussion rather than trying to slay anyone since its actually an interesting topic...