India's new air-powered car will cost just $2 to fill up

The next much-hyped alternative fuel may not be electricity, hydrogen, or compressed natural gas but something far more plentiful: air. Tata Motors, a massive Indian automaker (it owns the Jaguar and Land Rover luxury badges, among others) is close to bringing a compressed-air-powered car to market thanks to a pair of successful proof-of-concept vehicles. Of course, there are limitations -- the vehicle maxes out around 35 mph on its purely air-driven motor -- but the company boasts that it will cost only $2 to fill up the air tank. Which, when you think about it, is actually pretty expensive for air.