Based on proven technology used on the Space Shuttle, the Air Car runs on Compressed Air Technology, a pollution-free engine that burns compressed air stored in tanks made of carbon fiber. The only emission: Cold air that's used to run the car's onboard air conditioner.
The vehicle is built for city driving, as it gets about 100 miles per tankful. Why oil and gas companies are probably very worried about this latest innovation: The average cost of a fill-up is about $3.