reaction to former post.
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What you mean is that you would get centre wear of tire with 80 psi.
That wont happen. because there is a large range in wich the tires stays over the whole treath width to the ground.
Probably even if you really have only 70% of the weigth the pressure is calculated for on tire .
Then its best to keep the highest possible pressure with no bumping, to have as much possible reserve for things like, pressure loss in time, misreadings of pressure and weight, misyudging of weight, unequall load R/L etc.