I think YOU might want to re-read the sidewall. Usually it says- MAXIMUM PRESSURE or words to that effect. That means do not exceed the printed pressure no matter what weight is on it. For lighter weights, lower pressures ARE permitted, and usually recommended by the tire makers themselves for longer tire life. Using maximum pressures under very light loads as discussed here will NOT lengthen tire life, and will make the ride much rougher because it cannot cushion bumps.
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