Wednesday, September 2nd, 2009 AT 10:54 AM
So I have recently purchased a fairly nice Garmin GPS and according to it my speedometer is consistently 4 mph off at speeds over 50. It is 2 mph off at speed below 50 mph. I also have been feeling like I am driving slower than what my speedometer is telling me for the my last few road trips even before I bought the GPS. I am wondering if it is something that is a major job or something fairly basic and inexpensive?

