BSWS19 wrote:
Setting the pressure at "cold" temperature makes sense to me but, do I need to compensate any in AZ when "cold" tire temps can be 80 to 90 degrees? I usually set mine about 5 psi less than recommended and still see highway temps of 100 to 110 degrees.
I lived a number of years in Phoenix where above 110 on a summer day was frequent. No, do not reduce the tire pressure. In fact consider higher pressure when the temps are high. Tires get really hot on pavement and high starting pressures reduce flex and help with tire life and safety. You probably notice a lot of RVs on the side of the road due to tire issues on hot days. Quite often the reason is low tire pressure.