I'm in the same boat as you. On my third set of fronts at 60k miles. Inside of the fronts are down to the wire yet rest of the tire looks good. Going in Tuesday for the new tires to be put on so I plan on bringing the sheet with me.Is that sheet for the S550? It has track pack listed...??? I need to get this figured out for my next set of tires as well. Had it at Ford twice and whatever they are setting it at is eating my front tires alive. Even unmounted to rotate them and I still have the inner edge wore slap out and the tread is brand new in the middle. Maybe 20k on them and this is a DD as well and has not been on a track.