Re: Original 2004 Tires?
We have had our 2004 Prius since it was new and at 46,000 miles we still have the original GY Integrities on it with replacement in its near future. The tires have lasted this long with little wear because they have never been set lower than 42/40 psi, usually up much higher than the max. sidewall pressure. Don't worry about the pressure expanding beyond 44psi, that's what it's rated for COLD, any expansion is fine and will return to normal once the tire cools down. Whatever tire you decide on to replace your Integrities, be sure to look at Rolling Resistance, if it's available information about the new tire. Higher rolling resistance will mean lower mileage regardless of the psi.
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