In The Air Car the air is stored at 300 bar or around 4500 psi !!!
I'm a fan of this car. Tata, India's largest car maker, has signed a contract to use the technology.
It has some advantages over an electric car. It doesn't use batteries to store the energy used to power the car. The batteries it doesn't use don't have to be manufactured or disposed of.
Evidently air is a pretty efficient way to store energy since it has double the range of the most advanced electric car. The Air Car can also run on fossil fuels if the need be.
The Air Car can be refilled with compressed air in 2-3 minutes by a industrial compressor and 3-4 hours by a home compressor. The Altair Nanotech batteries take 10 minutes to recharge with an industrial charger but large scale production of these batteries has not yet happened.