No study I'm quoting - real life experience from me and others around me.
Prius tires at Toyota's recommended 32 psi. My Civic's previous tires looked almost this bad, at 5 psi above the recommended, but still 7 below sidewall max.
Acura MDX tires at 50 psi, after 60,000 miles.
2005 Honda Accord tires at 101,000 miles, 60 psi for the lifetime. They're about due for replacement, well beyond their expected lifespan.
