Has anyone noticed their speedometer being off? I've noticed that occasionally traffic around me doesn't seem to be flowing at the rate my meter says. For example, this morning coming to work traffic was moving at what my speedo says was 87-90mph. At 90 my tach said approximately 5300 rpm. Is that about right? My gearing is stock as far as I know (I'm the second owner). About what rpm is say, 55 and 70 mph for you guys?