Here's what I learned on a 250 mile day trip, mostly high speed super slab:
According to my GPS, the speedo has an approx. 5 mph error around 60 (indicates 65, GPS indicates 60)...approx 10 mph error at 122, GPS indicates 112.
High speed crusing will get me to reserve fast! Only 80 miles.

I need to get my front tire balanced.
Now, I don't ride like this normally. I just wanted to know. I love my Valk and just want it to perform at its best. Any thoughts on calibrating a speedo? The miles traveled is close. On a 87 mile run, the bike's odometer indicated 87, and the GPS indicated 88.
I figured my Valk would easily do 125 top speed on level no wind road. The bike has Cobra 6 into 6 exhaust with stock jetting...could that be affecting to top end?
Thanks for opinions...