I used to run around 32psi with the pilots while on the badly kept UK roads, inflating to 35psi whenever I took the car into mainland Europe (better roads) With the F1's I've found I have had to keep them at 35psi all the time as even at 35psi they manage to pick out everytram line on the road. I went accross both rears with a tread depth gauge a couple of weeks ago and interestingly I noticed the wear on both is exactly the same and they are wearing at the outer couple of inches more than the middle. This is the first time I have seen this on such a wide tire.
Hey Zr1 Fanz We were in Switzerland last June. Here's a couple of photos taken along the Furka pass. Should have stopped more for photos but too busy enjoying the roads

We are going back again this year. Shame there is goingto be no Hockenheim to go to afterwards this year though