efficiency

The Race to 100 MPG

Gas prices are up, fuel economy is down-but the brightest minds in auto technology are about to do something about it

Over the past several decades, the promise of the "car of tomorrow" has remained unfulfilled, while the problems it was supposed to solve have only intensified. The average price of a gallon of gas is higher than at any time since the early 1980s. The Middle East seems more volatile than ever. And even climate skeptics are starting to admit that the carbon we´re pumping into the atmosphere might have disastrous consequences. To these circumstances, automakers have responded with a fleet of cars that averages 21 miles per gallon, about four miles per gallon worse than the Model T.

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2006 London Motor Show

Green cars galore! The U.K.'s largest auto show debuts a slew of sexy new fuel-sippers

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Obsession: Mr. Singh's Search for the Holy Grail

American visionaries, cranks and con men have long sought the simple key to boosting the efficiency of the gasoline engine. Now a barefoot tinkerer in India believes he has unlocked the door. Is he for real?

India is booming. The expanding population has overwhelmed the Bangalore-Mysore road the way a river floods its banks, and the flow of two-way traffic is choked with a living history of human transportation. There are belching herds of diesel trucks, diesel buses and iron-framed diesel tractors. There are wooden-wheeled carts pulled by brightly painted Brahma bulls, and two-stroke-motor rickshaws fueled by kerosene or cooking oil or whatever else is flammable and cheap. There are mopeds and bipeds and bicycles and motorcycles, and every conceivable type of petrol-powered, internally combusting automobile, from doddering Ambassador cabs to gleaming 16-valve Mercedes miracles. But there's only one car like the one Somender Singh and I are riding in right now.

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