Diesel versus hybrid? Citroen figures you don't have to choose, that the combo of, say a 1.6-liter turbodiesel and an electric battery pack ought to produce outstanding fuel mileage. Built on the radically cool Citroen C4 three-door body, the Citroen C4 Hybrid HDi concept gets good fuel economy - using 3.4 liters of gas per 100 kilometers, it's close to the "3 liter" ideal - and spews low emissions. Most city driving can be done in the electric mode, Citroen says.
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