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Subscribe to this threadBMW Hydrogen 7 drops gasoline from the mix
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jake @ Apr 4th 2008 3:36PM
The equivalent mpg of the Hydrogen 7 is only about 15MPG running on hydrogen (it gets around 15 miles/kilogram H2 which is roughly the equivalent mpg) and it only makes 260 hp. The Honda FCX Clarity gets half the power at 134hp, but it gets 68 miles/kilogram.
http://www.wired.com/cars/energy/news/2006/11/72100?currentPage=2
So I hardly call the BMW Hydrogen 7 a technical achievement. Not only does it still emit CO2 and N2O b/c it's still a combustion vehicle, it doesn't do any better in efficiency than a normal 750Li, which gets 360hp and 15mpg city/23hwy. Remember this doesn't even factor in the energy loss from MAKING and LIQUIFYING the hydrogen in the first place.
I'm sure the Volt will get much better efficiency.
So, in short, it's BMW that looks "bad, slow, and unintelligent." That's why they are considering switching to focus on electrics, which both the Volt and the Clarity benefits from, since they essentially use an EV drivetrain.
http://blogs.edmunds.com/GreenCarAdvisor/203