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Old 11-28-2013, 02:42 PM   #7 (permalink)
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Location: 1000 Islands, Ontario, Canada
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Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 53.56 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 61.98 mpg (US)

Fancy Metro - '14 Mitsubishi Mirage top spec
90 day: 58.72 mpg (US)

Even Fancier Metro - '14 Mitsubishi Mirage top spec
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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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