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I found a lot of information on pneumatic cars using compressed air to move cylinders. I haven't found anyone using compressed air from onboard storage tanks to drive an alternator to keep battery charged and extend range. Has GM explored this concept for the volt? If yes, why wasn't it further developed? It seems to me that this option is a lot less complicated and less expensive than other alternatives being developed. The air driven alternator would replace the internal combustion engine.
 

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I recommended that GM investigate the compressed air rotary motor in this thread:

http://gm-volt.com/forum/showthread.php?t=15

Tata has the air piston vehicle currenlty selling in India and Europe, and ZPM has licensed the design to create a compressed air design that augments the air power by heating the air as it is released from the tanks.
 
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