The Air Car, developed by ex-Formula One engineer Guy N. For Luxemburg-based MDI, uses compressed air to push its engine's pistonn and the car goes for 300 kilometers at a top speed of 105km/h.

The World's First Air-Powered Car; Zero Emissions by Tata Motors of India: -

The Car, called the "Mini CAT" could cost around 365,757 rupees in India or $8,177 US.

The Mini CAT which is a simple, lightweight urban car, with a tubular chassis, a body of fiberglass that is glued not welded and powered by compressed air. A Microprocessor is used to control all electrical functions of the car. One tiny radio transmitter sends instructions to the lights, turn signals and every other electrical device on the vehicle. Which are not too many.

The temperature of the clean air expelled by the exhaust pipe is between 0-15 degrees below zero, which makes it suitable for use by the internal air conditioning system with no need for gasses or loss of power to the wheels.

There are no keys, just an access card which can be read by the car from your pocket. 

According to the designers, it cost less than 50 rupees (approx. $1.12 US) per 100km, that's about a tenth the cost of a car running on gas. It's mileage is about double that of the most advanced electric car, a factor which makes it a perfect choice for city motorists.

The car has a top speed of 105 KM per hour or 60 mph and would have a range of around 300 km or 185 miles between refuels. Refilling the car will take place at adapted gas stations with special air compressors. A fill-up will only take two to three minutes and cost approximately 100 rupees and the car will be ready yo go another 300 kilometers.

The car can also be filled at home with it's on-board compressor. It will take 3-4 hours to refill the tank, but it can be done while you sleep.

Because there is no combustion engine, charging the 1 liter of vegetable oil is only necessary every 50,000 KM or 30,000 miles. Due to its simplicity, there is very little maintenance to be done on this car.

This Air Car almost sounds too good to be true. We'll see in August 2012:

http://www.kerryhay.spiderweb.com.au

P.S. "My idea would be to harness somehow or utilize the 125 Pound Per Square Inch (PSI) of atmospheric pressure (free energy) that surrounds our body thereby causing a force too move a piston in order too drive the car, but this would mean that some-kind of vacuum would need or a reverse compression unit to be used on the other spectrum (end) for a propulsion thrust to occur too move the drive wheels. Just think, an engine that will never stop? Just a thought for those engineers to solve!!!!