Well mine is off as well so I don't feel left out now. Strange thing is that I've noticed it's off by different amounts at different speeds. I set my cruise on flat roads so I could check it and it varies from 1 to 3 MPH with the digital always lower than the dial and the faster you go the bigger the difference. Outside temperatures seem to affect it as well, the hotter the greater the difference. I set up my Garmin and it matched the digital speed exactly every time and at all speeds so I'm going with the digital read out as the accurate one. Off by 1 MPH isn't bad but 3 MPH when you're already pushing 5 over the limit is going to get me a ticket.