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Originally Posted by Dean
Autocross ... probably represent more wear on your car on a per day basis than a driving school, but given the cost differntial, it is probably pretty close to a wash.
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I disagree. Once day of autocross is about 6 minutes of driving. One day at a PDX/HPDE is usually around 90 minutes of driving. While you can make an argument that the harshness of the transitions at autocross may put more wear on things like wheel bearings, I don't think there's anyway you can compare 90 minutes of tire and brake wear at much higher speeds vs. 6 minutes of autocross, or the time the motor spends under much harder loads at the track and all the shifting at the track vs. almost no shifting at autocross.
(BTW: haven't we had this exact argument before?)