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Old 11-27-2009, 01:38 PM   #3 (permalink)
Christ
Moderate your Moderation.
 
Join Date: Nov 2008
Location: Troy, Pa.
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Pasta - '96 Volkswagen Passat TDi
90 day: 45.22 mpg (US)
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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.
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