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Old 12-31-2009, 05:23 PM   #1 (permalink)
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Truck cap window propped open

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According to this link I lost mpg when I put my truck cap on. Would propping the rear window open help me get some of it back? Today I tried aba testing with my scan guage but the numbers were all over the place being windy out. Check out the photo.

http://i364.photobucket.com/albums/o...456789/016.jpg

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Old 12-31-2009, 05:29 PM   #2 (permalink)
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No. Not measurably.

Your flush cap has converted your pickup into the aero equivalent of a van or large SUV (Suburban, Excursion).
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Old 12-31-2009, 06:01 PM   #3 (permalink)
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No. Not measurably.
This
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Old 01-04-2010, 05:15 PM   #4 (permalink)
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cap

I would have expected that you would pick up about 5% Mpg with the cap.

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