As most (if not all) of you know, psi increases as tires warm up due to driving. My experience, here in Fl. where air and road temperatures get ungodly hot, is that it is not unusual for tires to gain...
I see that you have weighed in your previous post. Did you see the chart I posted there for your H rated tires? Tire pressures are set and checked when the tires are cold. 90 psi is good for 3970 lbs for a single tire and 3710 for dual tires. I add 5 psi extra to my tires because I'll still drive with a strong cross wind which shifts a lot of weight to the down wind side.