It reads about 9% higher than actual (GPS-measured) speed at all speeds. This is a conscious decision by Suzuki. Most scooter manufacturers do likewise; there are rare exceptions but you'll never see one that reads low on a stock bike (due to regulations).
Rusty J - I don't mean this to sound insulting, but I suck at NOT sounding insulting. I worked as an engineer in automotive for a long time. Never did electronics though. And I can say, from all my experience, there's a reason behind the inaccuracy. 9 times out of 10 it has to do with $ (or Yen in this case). My guess is there is some component(s) of the speedometer system that is carryover from some other bike, or several other bikes. And the conscious decision was to save money and carry it over, even if it is not so accurate.
All - Yes, I wear a helmet. I didn't mention it as it is required in GA and to me a helmet and 2 wheels go together like peanut butter and jelly. I bought a modular helmet. And yeah, sure, the modular is going to be louder, I get that. At any rate, when I ducked behind the screen I was in Nirvana. Steve's windshield looks interesting. Because it is not as big as a barn door (like I had mentioned) and seems to get the job done via shape and technology, versus being HUGE. I will be researching.
However, I'm not certain I'm going to commit the money, as my romance with my Burgman right now is low. Our relationship is on the rocks.