GENEVA – Renault SA is nudging the “something-for-nothing” department with an aerodynamics-improving device the company says saves 5 kilowatts (6.7 hp) of engine power and translates to measurable fuel economy gains – all for an energy input of only 10 watts. At the recent Geneva auto show here, the French auto maker unveiled a sport-wagon concept named Altica. The car’s drag coefficient of 0.30 is reduced by 15% at 75 mph (130 km/h) when using the company’s prototype “synthetic jet.” ...

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