"With a few exceptions, such as Volvo's Air Motion Concept, major automotive manufacturers have generally shied away from compressed air technology. PSA Peugeot Citroen is bucking this trend with its 'Hybrid Air' powertrain that addresses the limited range of compressed air energy storage technology by combining it with a gasoline powered internal combustion engine. The company plans to have Hybrid Air powered vehicles on the road by 2016."
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http://tech.slashdot.org/story/13/01/25/1713215/peugeot-citroen-to-introduce-compressed-air-hybrid-by-2016