"I usually get in the mid 40's and it dropped to 38-39ish."
First, yes your odo is off, but in comparing previous mpg to trip mpg that makes the odo difference pretty much a wash. That said, a decrease of 15 percent while operating at higher RPM consistently, in wind, fully loaded I think that decrease is to be expected and I am surprised (a little) your mpg did not drop more. Also, who knows what quality of gas you got well out in the "backcountry". Unless the decrease in mpg continues when you are back to your normal routine, I would not worry about the bike needing any checks/adjustments.
Forty years away from 2 wheel fun. Sure is great to be back smelling the roses!!!
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