Chevrolet used carbon fiber, magnesium and other unusual materials to control the weight of its 2014 Corvette. By Neal E. Boudette and Mike … But pressed to produce cars and trucks that go farther on a gallon of gas, manufacturers gathering here this week for the Motor City's annual auto show are cutting weight by substituting more plastics, aluminum and magnesium, including materials once found only in high-end race cars. Only a handful of parts fashioned from … …

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Detroit AUto Show: Car Makers Trim Weight to Bosot Fuel Economy …