Go back to Red Rock Energy.

A group in Joplin Missouri, headed by Terry R. Miller, has at least 3 cars running on compressed air. They don't have a web site that I know of.
Telephone #s
(417)624-5585

International Pneumatic Urban Commuter Club
Terry R. Miller, President
(I removed the phone number and address because he died in 1997).
I don't know what will happen to this project now.

Toby Butterfield, Treasurer
511 Main Street
Joplin, Missouri 64801
(417)624-5585

They have a patent.
US4370857, Pneumatic system for compressed air driven vehicle.
Miller, now deceased, built several cars in Joplin, Missouri. These were based on a Ford Escorts chases. The engine was composed of 2 halves. Each half has two double acting cylinders in series for a total of 4 expansions. Each half was geared up, yes up, and directly connected to each front wheel. The storage tank was a light weight fiberglass pressurized to 3500psi. The high pressure was reduced through an expansion pressure regulator to 500psi. The engine power was controlled by a throttling valve to 0 to 500psi.

There seems to be something wrong with the IBM patent site and the cover page is missing.

This is in patent language and shows a totally impractical car design. Use the information presented to learn about the concepts of the pneumatic engine.

Transport For The Future:
The Compressed Air Car!