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aerohead · 07-15-2009, 05:26 PM

I tossed your numbers around on Al's calculator.30-inches of added frontal area to a car with say,20-square feet of frontal area would raise the drag by 1-%.The mpg penalty at 55-mph could not be over 0.5%.Since a jump between 35 and 37 is on the order of 5% mpg,the wheel skirts should not be able to alter the mpg to this magnitude.I think there is more going on than just the skirts.Just my guess.

07-15-2009, 05:26 PM	#6 (permalink)
aerohead Master EcoModder Join Date: Jan 2008 Location: Sanger,Texas,U.S.A. Posts: 15,892 Thanks: 23,969 Thanked 7,221 Times in 4,648 Posts	frontal area I tossed your numbers around on Al's calculator.30-inches of added frontal area to a car with say,20-square feet of frontal area would raise the drag by 1-%.The mpg penalty at 55-mph could not be over 0.5%.Since a jump between 35 and 37 is on the order of 5% mpg,the wheel skirts should not be able to alter the mpg to this magnitude.I think there is more going on than just the skirts.Just my guess.