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I think it's received wisdom that over-inflated tyres bulge in the centre of the tread and wear unevenly, from the olden days of cross-ply tyres.
'Overinflation' of a radial tyre will reduce sidewall flex and that is where rolling resistance is reduced. Not due to a smaller contact patch (which may exist due to the circumference of the tyre sitting a little less 'flat' on the road, possibly)
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