If your key isn't in "Run" position, or at least in "On" position, it's not recording mileage in most of today's vehicles. The ECM controls the mileage readout based on VSS and other sensory inputs, so unless the ECM is powered, chances are you're not getting the mileage update.
__________________
"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
|