I tested my tires prior to leaving and they were at 90 psi, thought they were really cold and would warm up down the road a bit. They heated up to about 95 to 98 psi so I stopped and tested them again, decided to add air on the road at a rest stop. Never read below 108 the rest of the trip. I didn't know that about DT only allowed to put 80 psi in each tire installed. Guess you learn something new everyday!