I had to put my GPS into the tank bag twice because of rain, so there were two small periods of time not recorded on it. It shows a moving average of 72mph. However, it only accounts for 1054 of the total miles. My odometer shows 1101 miles. 1101 miles divided by 18.1 hrs. is a total average speed of 60.83 mph which includes all stops. Other than construction zones or refueling stops, we were never in the 60s in Iowa, Minnesota, or South Dakota.