Gotta look at all the angles Bob!

Care to comment on the Tata "Nano"?
World's cheapest car ( $2500 U.S. ) going on sale this year in India.
( Not legal for U.S. import... zero airbags... but it does have recycled shoe laces for seat belts.

Then there is the slightly more expensive, but not much ( $8500? ) air car.
Tata motors I think has signed to start manufacturing cars that run on compressed air. You can fill the 4000 psi air tanks in about 4 hours with a plug-in compressor at home I guess... and get 40 miles of driving. Releasing the compressed air gives you free air conditioning ( good for India ) but no ICE, so no heat for us Minnesota drivers!

I guess you can get one with, or without a small lawnmower engine to run a compressor if you are away from grid power. Sorry I lost the link.

The Indian air car uses pistons just like an ICE.
There is an Austrailian inventor who has an air car with a rotary engine... runs by something like turbine vanes. They are already in use for trucks and carts that need to run indoors, like shipping warehouses.