2013 Ford Focus SFE

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    Over the past few years, more automakers than ever have started to promote something called active shutter grille vents. Essentially a way to boost fuel economy at higher speeds, active grill shutters are now being used by GM, Ford, and Chrysler--among others--to give gas mileage boosts to their highest-efficiency models. But what are active shutter grille vents, and how do they work? In a conventional, front-engined, water-cooled, gasoline car, air is drawn through the grille and into the engine bay, either sucked in by the radiator fan, or forced in by the movement of the car through the...

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