Are you resetting both the MPG and miles? doing that, I think, starts off the trip with no MPG initially. I did that while in motion yesterday.
Isn't this a Microsoft software product? if that is so, we should be getting changes reloaded nearly every day. duh.... I guess we take the wireless laptop out to the car, plug the cable into the usb socket and everything will be right for the day.
Right now I don't think the mechanics have a clew ... I have a screwed up AM in the radio and am holding off taking it in for a couple of weeks, hoping they may may learn something meanwhile.