09-07-19, 06:33 PM 
		
	
	
		I tend to find they are pretty spot on. I have a speedo healer on my bike and it's set so that the speedo is pretty much 100% accurate and always seems to read the same speed as the signs. The car on the other hand I find is around 10% off all the way through.
Using the gps on the sat nav I can consistently do 10% more than displayed on the speedo and still be within the limit on the gps.
Accounting for the old 10%+2 myth I can actually do around 85mph on my speedo before I'm 'actually' speeding
	
	
	
	
Using the gps on the sat nav I can consistently do 10% more than displayed on the speedo and still be within the limit on the gps.
Accounting for the old 10%+2 myth I can actually do around 85mph on my speedo before I'm 'actually' speeding

