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Have you studied aerohead's pickup?
Regardless, though you increase drag area with a big airdam like this, I still think it is likely a win... air to the side is still better than under. Why not build and test a prototype with cardboard? You could do some A-B-A testing coasting down hill from 0 mph or along a flat 50 mph-0 mph. In the first case measure speed differences. In the latter case measure time and distance rolled to a stop in neutral.
Also, you could add a tonneau cover to the bed--even make one fairly cheap. If you have great skills there are dudes here who have built inverted boat tail shapes onto their beds behind the cab.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
Last edited by California98Civic; 05-28-2018 at 12:55 PM..
Reason: *airdam, not "airway" ... darn autocorrect!
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