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Old 01-02-2013, 03:03 PM   #5 (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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Perhaps you're not asking the right questions. How about, "What is the best way to test a new aeromod?" or, "Is dealing with the high pressure pocket in front of my windshield worth my time/money?"

If you're looking to test an improvement, mist or smoke is probably not the best idea. A deflector at the base of the windshield (I assume that's what you're planning) is not going to do much, so even the almighty coast-down test might not even show results. You could try tuft testing or coast-down, but don't expect much- even from the best executed windshield deflector. You might not even see an improvement at the pump.

Try a grille block, air dam and smooth wheel covers instead- they will actually help your FE!
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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