I have an ‘18 1090R. I just got finished riding the NVBDR. I’ve known for a while that my speedometer was inaccurate. I was using a cellphone gps and I believed it was displaying 2 mph higher than actual speed. Now I’m using a Garmin Zumo XT. Now I’ve learned that it’s 2 mph higher around 40 mph, 3-4 higher around 60 mph, and 4-5 mph higher around 80 mph. Anyone have any thoughts?