Corporate America's newfound preoccupation with energy costs has made efficiency a hot business.

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Higher as in 1, 200 degrees Celsius, which would heat air hot enough to run a high efficiency turbine like those used in fossil fuel power plants.

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These winglets, which Cessna says increase fuel efficiency and takeoff and landing performance at higher elevations and on hot days, were previously available as an aftermarket option on the Citation X but come as standard on the new model.

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