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Old 08-19-2012, 02:08 PM   #2 (permalink)
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Join Date: Aug 2011
Location: Warren, MI
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Boo Radley - '65 Ford F100
90 day: 13.28 mpg (US)
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The consensus here is that VG's are useless for fuel economy, and sometimes detrimental because they sap energy to generate vortexes. You'll want to research boat tails, belly pans and gap fillers. The deflector is only the beginning!

Boat tail:

Gap fillers:


Smooth belly pan:

Start reading!

PS- here's the primer course
He gave me a dollar. A blood-soaked dollar.
I cannot get the spot out but it's okay; It still works in the store
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