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Check the manual, and you may find a second, higher set of pressures specified for traveling at sustained high speed (or with a full load). That will give you an idea of what range the manufacturer considers reasonable.
Nobody can really give you a specific answer for your question, because it depends on your road conditions & driving style.
But most people will agree that the manufacturer suggests pressures that are a compromise of comfort/handling/economy. Many people here just add a bit of pressure, little by little, to get a sense of how it changes the equation.
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