I think it is rounding !
Let’s say your trip started when it was 29,349.4 (displayed as 29,349)
That would move to 29,350 when your trip said 0.6 etc etc...
You can figure out the exact distance on the odometer by looking at the trip. So if the odo changed when the trip said 0.7, the odometer was at 29,349.3. Keep your eyes on the road tho’
Alohart, over the pond we are still miles, but have at least made the transition to Celsius vs Fahrenheit. Kilograms are becoming common (but I still think in stone). We are still a long way off from kilometres ! No rush !!!