...And that's also when the recommendation for which tire pressure standards to use/follow was changed to say that the tire pressure placard inside the driver's door should be followed, regardless of the pressures listed on the tire sidewalls.
Which is why my F-350's fronts are at 55#, and the rears are at 80#, and why every @#$%^&*$#@ time I get new tires put on- no matter who/where puts them on, or what instructions I give them- I have to drive the thing home, and increase the tire pressures to spec.
The first time I drove it home from getting new tires, I almost rolled it- it is crazy squirrelly to try to keep on the road when all the tires are at the same 35# or whatever the sidewalls say is correct.