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My mom runs 50 PSI on her Prius. I ran 68 PSI in my Civic. Currently running 80 PSI in my Insight. Wouldn't recommend over 60 PSI unless you're an extremist.
From what I've read/experienced, tire wear seems to be best at sidewall max, and >70 PSI accelerates wear slightly on tires. Not all cars show a MPG improvement past 60 PSI, so unless yours does don't run them past 60 PSI.
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2013 Toyota Prius C 2 (my car)
2015 Mazda 3 iTouring Hatchback w/ Tech Package (wife's car)
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