Two companies are developing the car. One Australian, the other, French. The French company has sold an order to Mexico City for taxis and other fleet vehicles.
They can't defy physics if they are in production, can they?
http://news.bbc.co.uk/1/hi/world/americas/992431.stm
Of course you can make a car that runs on compressed air. That is not the part the defies physics. I'm sorry, and I mean no personal offense, but you clearly just "want to believe", and so you believe. The claims made in this article are outrageous, and anyone looking at them with an open mind and a basic understanding of physics sees that in the first few sentences.
Look at the date of the article you linked....
Mr Negre says a tank-full of air - on which a car can travel up to 200km (120 miles) at a speed of about 90km/h - is equivalent to two litres of petrol.
Hmm, anyone know the work necessary to compress air (let's just say standard temperature and pressure) to 4500 PSI at -100 C?
That amount of work is the *maximum* work available to be converted to kinetic energy.
And petrol has (if I'm quoting P.J. O'Rourke right) 31,250 kcal / gallon.
Can 2 liters of petrol take a car 120 miles at roughly 60 mph? That's two hours at highway speed, for 1/2 gallon.
I don't think even a Prius can manage that--unless you are coasting downhill.
Something doesn't seem to add up.
Cheers!