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Old 05-06-2011, 01:37 PM   #8 (permalink)
Master EcoModder
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From Ford's website:

"The subcompact Ford Fiesta is available with a Super Fuel Economy (SFE) package that enables the car to achieve 40 mpg highway. This package features cruise control, low rolling-resistance tires and several additions to enhance vehicle aerodynamics, such as underbody shields, side air deflectors and lower grille blockers."

Maybe the "side air deflectors"? Kind of a vortex generator?
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