Your issue is a non-issue
the SG clears this data, called recent trip data, after the car has been off for a minimum of 3 minutes.
As far as I know, the SG starts processing data as soon as your ECU receives voltage, i.e. when the key is on. Only after cranking and the sensor readings come into the ECU does the SG display these treasures
you probably already knew that though. I need to get to bed!!
If you have any more questions, feel free to ask sir!