This has been in development for years, but here's an update from Wired: Worried about rising gas prices and automobile pollution? Relax. If a European company has its way, cars could soon be running on air. By the end of this year, Moteur Developpment International, a 12-year-old company headquartered in Luxembourg, says it plans to distribute model fleets of so-called "air cars" in Spain and France. As the name implies, this is no ordinary car. It runs entirely on a stream of air delivered to a two-stroke engine. No gasoline, no pollution and no costly expenditures at the pump. Eventually, Guy Négre, the French inventor of an engine that runs on compressed air, hopes to establish an international network of local manufacturer-dealerships to sell "air cars" in urban areas. But without a constant stream of investment to develop the technology, the car may go no further than the test parking lot in Carras, France. More here I just hope that this doesn't die a death. It'd be a shame to see such a promising technology disapear.