Coming home from Sturgis I checked it twice, one tank was 40.3 and the next was 43. That was riding the interstate at the speed limit 70-75 depending on which state I was in, and that was two-up with a loaded tourpak and bags.
And I don't "fret" over it, I check it about two or three times a year just to get an idea of what I'm getting for mileage. I'd say that anything above 35 is doing okay, but that's just me.