I say forget the specs. Due to no correct specs for tire pressure on my Dodge Ram 2500 with monstrous Arctic Fox truck camper on the bed and hugely overrated regroovable tires...
I found a better way. Just look at the tires'
Pump them up until the tire tread and crown are the right shape. That's it!! That's all you need to do.
If they are wearing on the edges and only rhe edges are making contact, put in more air until the middle of the tread makes contact too.
If they are wearing in the middle and the edges aren't making good contact, let some out. You are overinflated.
It's really that simple. There is nothing else to it except making sure never to exceed max pressure as labeled on the sidewall of the tire. And maybe if you go from the equator to the Arctic, note that the tire may need more air.