When/how/why max tire pressures raised from 35 PSI to 44 PSI?

sireland67 said
I am pretty sure my Ram 3500 the door sticker says 80 psi.
It did not take me long to lower the pressure down, it was UN-bearable to ride in empty.

dibbons said
It used to be maximum recommended passenger tire pressures were 35 PSI, now I understand they have jumped quite a bit to 44 PSI. What has changed in tire technology to justify the higher pressures? I still run my tires at 35 PSI , seems like 40 PSI or 44 PSI would be a pretty stiff ride.

I always run the max of what the tire says on passenger cars. Trucks, well you just gotta use your head. I adjust for loads. I run less in the rear than on the front with empty loads. I remember when it was 32# forever and then jumped to 35. You just gotta keep an eye on wear and adjust accordingly. Most tires suffer from under inflation wear from lack of maintenance.

A few years back my Dad was going on a trip across some desert areas. He asked me if he should get new tires first. He had some shoulder wear from under inflation. 35# on the side of the tire. We run em up to 40# and i told him to check em when it was really hot and don't let em go over 45#. He never adjusted them. He got over 30 miles to the gallon in a 302 fuel injected 1981 Lincoln Town Car. They must have been like bicycle tires out across that desert.

I'll have to agree with the EPA comment.