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Old 11-28-2013, 02:42 PM   #7 (permalink)
MetroMPG
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Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 22,513

Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 52.71 mpg (US)

Even Fancier Metro - '14 Mitsubishi Mirage top spec
90 day: 70.75 mpg (US)

Appliance car - '14 Mitsubishi Mirage ES (base)
90 day: 60.16 mpg (US)
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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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