With spirited riding I get 34-35, 33-34 with wifey on back 36-38 hwy if not spanking it. I usually fuel up at 120 miles, I've burned 3.5 gallons so close to 1.5 gallons still in tank HOWEVER the fuel guage needle is in the lower red and looks like it's empty but it's not. If your engine runs rough in the 3000 - 4000 range that's cruising rpms and that's whats killing your mileage. You're right you may have to change tuners to clear that out if I guessed I'd say it's pig fat in that area. Call TAB those guys are great I had a set of slash cut baffled and they helped me out - I've got a Dobeck style controller and tuned it out myself.
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