When i do my GPS tracking, it highly depends on the route how much distance is without stops, but even one stop kills the average speed rating.
Example: Car ride. 94 km/h max speed, 20km distance, out of city mostly, so biased towards freeway. Yet, 64km/h average speed. WITH stops counted, 61 km/h average (so, standing counted, but not counted it is only marginally higher).
With my scooter: 9km mostly without stops, 22.9km/h max, 16km/h average (18.5km/h moving only).
With scooter and more inner city but mostly without stops: 27 km/h top (kicking downhill with rear wind), but 15 km/h average.