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Old 08-16-2008, 09:07 PM   #6 (permalink)
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Join Date: May 2008
Location: DC Metro
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Ranger - '08 Ford Ranger XL
90 day: 20.73 mpg (US)
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Anything that increases your frontal area is going to increase drag. The fairing also is going to disrupt the flow over your car and cause it to become separated, increasing drag further.

Sealing the pocket would also reduce drag.

All of the effects are small, and have most effect at higher speeds. The cost savings won't be huge, so you just have to balance features you like with trying to raise your Fuel economy.
Ohio State Baja SAE
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