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Tyre pressure confusion

I put a set of continental GP urban 35mm tyres on my gravel bike for some comfortable road riding. All the tyre pressure calculators I've used suggested 45 - 50 psi as optimal for this tyre size based on total weight of 75kg , but the tyres themselves say min 65 psi. Any idea why the manufacturer min would be so high relative to the calculators?

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Backladder | 2 hours ago
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That is a massive pressure for those conditions, I run 65 psi for 32mm tyres with 110kg all up weight and don't have a problem with pinch flats even on our rough roads. I would use the chart pressures which seem reasonable to me and ignore the manufacturer as they are probably assuming heavier all up weight and lack of maintenance.  

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Geoff Ingram replied to Backladder | 1 hour ago
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Completely agree. At 80kg or so all up 45psi is good for my gravel bike with 39mm tyres. And after a fair while, when it drops to 35 I put it up to 45 again. 65psi is for my bike with 28mm tyres.

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Hirsute | 3 hours ago
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Says it can go up to 85 psi. All I can think of is something about the tyre wall that needs a higher pressure but it is out of step with the charts as you say.

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