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windrider919, just curious what truck you're driving and your before and after modification mileage. Seems you've done most of the big gain mods.
Sounds like you're asking a question for which nobody here knows the complete answer. This forum is for sharing new ideas and testing new ideas and is by no means complete. Since few trucks have the small spoiler you are asking about, do a test and report your findings. This may be a beneficial improvement to the teardrop bed cap - or not.
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