Anyone else having this issue? I noticed it on my first ride with the machine. Figured maybe I didnt get the gps right. This last trip I took, I used 2 gps units, both the gps registered 155 miles and the machine registered 167. Have I got a bad sensor or something?

[2015 Z Force 800 53/Trail EPS]

How does the speed calibration seem to be? If it reads faster then the GPS all the time that could be your issue. You can set that and that will also change the odometer readings.

Didnt think to look at speed as well, I will check that next ride. Thanks.

Depends on the route you take.  If you drive 10 miles perfectly straight, GPS and Odometer should be very similar.  If you drive lots of tight turns, odometer will always be a higher number than GPS.  GPS measures straight line point to point so is always slightly shorter than wheel distance on a curve.  Mixed driving my odometer is typically about 6% more than recorded on the GPS. 

Depends on the route you take.  If you drive 10 miles perfectly straight, GPS and Odometer should be very similar.  If you drive lots of tight turns, odometer will always be a higher number than GPS.  GPS measures straight line point to point so is always slightly shorter than wheel distance on a curve.  Mixed driving my odometer is typically about 6% more than recorded on the GPS. 

That makes sense