at a roebling road drivers school, I set the fronts at 41 and the rears 37 (10% less) based on the expectation that the wieght bias was around there. After a good run , checking the amount of roll over on the tread, it appeared that for that day (heat index over 110), in that car, that was a good pressure. I set them cold in the morning After a run they would go up about 4-6 pounds depending on the time of day and how hard I ran them. scott