Running on air

The NYT reports:

IN the push to free the auto industry from its dependence on oil, all kinds of alternatives are being tried. Consider now the refreshing concept of cars that run on air.

The idea sounds simple: compress air and release it to operate a piston engine. But the execution is difficult, and in one form or another it has occupied engineers since the 19th century.

Another inner-burb car idea getting to market.