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While we are at it, a small query -
The contact patch varies with tyre pressure, as at higher pressures, the vehicle weight is countered by a smaller deformation of the tyres and thus a smaller contact patch.
As the tyres are pumped up to say 50 or 60 PSI (which the auto company did not intend nor prescribe), would its overall dia change to affect the effective turns of tyre per mile and hence the odometer accuracy? What would the delta be from say 30 PSI to 50 (or for that matter 60 PSI) for a vehicle ~2400 lbs?
IMO tread wear should also affect the odometer the same way.
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