Why does Rinkai have more mileage than the gps provider?

First of all, discrepancies in mileage arise due to the difference in the display of the track.
GPS providers connect track points by air, Rinkai overlays them on existing road grid.
These discrepancies occur when the tracker gives a small failure and sends the coordinate closer to the neighboring road (oncoming lane, sidewalk) and Rinkai is forced to “draw” this run.
Usually considered normal difference between gps km and Rinkai is up to 5%
In case of large discrepancies, you can change the location of the tracker in the vehicle for free “vision” of the sky, or there are special remote GPS antennas.