Build a timeline, not a single number
Useful mileage evidence includes dated service invoices, inspection records and past advertisements. Compare each record with the dashboard reading and check that the date, vehicle and unit of measurement are correct.
A decrease or an unusual jump needs investigation. It can result from an entry error, a unit conversion or a replaced instrument cluster as well as possible tampering. One inconsistent reading does not establish the cause.
What to compare
Dates and readings
Place the available entries in date order and look for unexplained changes.
Kilometres or miles
Confirm the measurement unit, particularly for imported vehicles and overseas records.
Supporting documents
Ask the seller for original service and repair invoices that can explain a discrepancy.
Physical condition
Have wear, maintenance and mechanical condition assessed independently.