Tire pressure (temperature) increase while driving

Ivylog wrote:
It's normal to have a 10-15% increase in pressure on a hot day BUT you are getting a 30+ % increase. I would try +10 psi.

I agree.

Also, check and make sure the brakes are not dragging, creating heat. Not rocket science-- just put your hand on the center of the hub after driving. Should be warm, but certainly not hot enough to burn your hand unless you just completed a panic stop.