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<p>This is the crucial piece of information that can only be estimated if one is familiar with cars, otherwise, it is an unknown if there are no possible ways of arriving at this number, as I’ve asserted previously. Given this, the cause of the rubber deposition is a necessity if an alternative method for deriving the correct answer is needed (or would you rather those of us who haven’t maintained a car before to simply stare at the question and wait for the “best” way of deriving it comes up?)</p>