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Japlonik (an Audi-sponsored… guy? site? simulacrum?) offers ‘More on the MDI Air-Powered car’:

The company is moving forward on its
plans to offer an air-electric powered vehicle for sale in 2005, and
even created prototypes of several models, including taxicab and
pick-up truck designs.



I couldn’t find a comments slot on the site, so I emailed ’em:

This isn’t air POWERED of course; maybe more like air ‘assisted.’ Which
is to say: compressed air isn’t the source of energy, its the 
energy storage — equivalent to a battery. The air needs to be 
compressed by a separate process (motor, compressor, etc), which 
needs to be powered by something (solar, wind, biofuel, hydro,
fossil  fuel, etc.). The emissions profile of the vehicle will
depend on that  source, _its_ efficiency, etc. TANSTAAFL.

(What’s TANSTAAFL? ‘There ain’t no such thing as a free lunch.’ You obviously haven’t read enough Robert Heinlein.)