I am glad you asked this question. I will be very interested to see the answers that are posted. We have had our 2013 2350 for less than a year so we are still learning about it. I run 70 Front, 75 Rear when cold. In hot summer weather I check the pressure every few hundred miles on a long trip and may adjust downward a bit. When you are going down an interstate and it is in the 90s or more, you will really pick up some air.