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Having just read through the thread, I don't see that anyone has mentioned some of the obvious improvements; that being the underside of the truck.
As is, it seems to be slightly nose up, and this won't improve with a trailer in tow.
Depending on the needs demanded by usual roads, drop this down to no more than 6", give it a bit of forward rake, put on a front air dam, and try and smooth the underside as much as possible, then repeat MPG test.
cheers
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