Compressed Air Power

The perpetual-motion machine may be eons away, but the the first commercially viable car to run on compressed air may be at hand. The brainchild of French inventor Guy Négre, the MDI, which we first reported on in 2005, employs a novel system of compressed air tanks and an internal-combustion support engine that can either power the minicar or compress the air used in its tanks. The urban runabouts, which come in a number of configurations, are built from fiberglass over a tubular chassis. MDI plans to offer them with a host of information systems that interface with the car's inner workings and provide connectivity to the internet and other systems as well as digi entertainment. A new partnership with India's Tata motors -- the country's largest carmaker -- may mean MDIs could show up en masse soon. Maybe even this very decade. – Mike Spinelli, Jalopnik

The Air Car - zero pollution and very low running costs [Gizmag]