Michelin once sent me a chart covering recommended pressures in their tires. Some highlights were:
The pressure on the sidewall is maximum cold pressure.
The proper inflation pressure for any tire is going to be set according to the amount of weight being carried by that particular tire to a maximum of cold pressure shown on the sidewall. With the chart from Michelin, I weighed the front axle, divided by two (tires) and inflated according to their chart. Same for the rear wheels.
My truck comes from GM with a recommendation of 60 front and 80 rear. This is based on maximum load, properly distributed. When running without cargo, the inflation pressures don't need to be that high but it is impossible for the factory to know with what weight you have on the tires, hence they go with what would be maximums.
Cannot locate the chart right now, otherwise I'd include an example.
Michelin was the only manufacturer able to provide that information to me at that time.