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More info on my trucks: All are/were extended cabs with 6 foot beds and 5 speed manual transmissions. And, as I said in my earlier post, all three got better fuel economy with the toppers on than with open beds.
It would be nice to hear more experiences from other drivers and compile these experiences in a table and see if we can deduce any trends from that, rather than just guessing and theorizing, though the guesses and theories are interesting, also.
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