I now have a total of 1300 miles on my TDI after the 500 mile trip. I am using stock settings (35 psi) for my 17" Avignons, it is a six-speed manual trans, and I was the only passenger with one full suitcase in the trunk. Speed limits ranged anywhere from 55 - 70 MPH; however, I had the cruise set on 65 MPH for the majority of the trip.