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@GA2G
I slightly increase my psi as proper winter approaches, as the psi is reduced by the colder weather/roads,
because cold causes gas (air in tyres) to contract, and heat causes expansion.
On a really hot day (hardly ever happens in this country), I actually will let a little air out of fully pumped tyres.
The heat of the road/weather will ensure the expected gas expansion.
EDIT:
I should add the proviso, that I have to keep my tyres at near maximum psi, as I'm a heavy guy, and I try to avoid pinch-flats.