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Old 11-18-2011, 01:29 AM   #8 (permalink)
JasonG
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Join Date: May 2009
Location: Charlotte NC / York SC
Posts: 728

05 DMax - '05 Chevrolet 2500HD
90 day: 18.48 mpg (US)
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Like Frank said, once the air is under there you will just be adding drag.
Now I have considered trying a sortof wedge shape cross between sideskirts and an air dam in front of my rear axle to force air out .
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I can't understand why my MPG's are so low..........
21,000lb, 41' Toy Haulers are rough on FE!
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