I bought a car a few years ago and one rear tyre was rather thin in the centre of the tread (barely legal). One of the first things I do with a new car (before servicing it), is check the tyre pressures. All the rest of the tyres were at the manufacturers recommended 32 psig but the baldy tyre was 48 psig. I replaced it, set it to recommended pressure, and never had any further issues.
I do not increase my tyre pressures above the recommended figures for that very reason.
I tend to keep my spare up to the max allowable pressure, and if I need to use it I deflate it to the recommended pressure (some manufactures have different values for each axle). Perhaps that was the case here only it had never been corrected.
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