Seems a bit thirsty
I averaged 20 kpl in Argentina, TT600RE fairly loaded with wide ally boxes, didn't get in to 5th much due to the wind. Max speed would have been 110kmh generally 90-100.
As I understand it the second stage of the carb (YDIS) kicks in around the 90 kph mark when cruising due to the throttle position you require to pull this speed. Try slowing down a bit and see if it gets better. Remember it's a marathon, not a sprint.
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