The Volkswagen XL1 just debuted in Geneva and claims a range of 261 mpg, with a curb weight of about 1,750 pounds. Its coefficient of drag is extremely low at 0.189. It's powered by a 47-hp, two-cylinder turbodiesel paired with a 27-hp electric motor. VW says it will make 250 examples with a price near $100,000.

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