When you get a mercury ECU scaned is there any reason that the total recorded hours and the RPM break down hours don't match???
In other words if say the total run time hours = 100 and the RPM break down hours equal say 60 is this normal or is something going on??

the total run hours can not set back zero.
the RPM run log can be reset .
Mac

I spoke with a tech at Mercury and they said if the ECU was reflashed it clears all history prior to reflash.
I get that but I don't get the difference in total run time and the RPM break down hours being so different...