If you are not able to test something accurately does not mean someone else cannot do better. O fcourse even these results there is variation. Last run 0,1kWh change came from temperature. The other variation came from start which reason is unknown to me at this point.
https://youtu.be/JhcDhwnwU0I
That 2nd run to east was off from start. Almost came to same result still.
5 times 16,4 and one time 16,3=98,3/6=16,38
4 times 14,1 and one time14,2=14,12
--> Average consumption in my test route 15,25kWh
What is the accuracy if you don`t take the temp changes into account?
I say its under 0,1 kWh accurate based on this set.