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Maybe a silly question since I know it all depends on the load of the car, tire manufacturer and a lot of other details but still. Specify tires and inflation below.

I have Cooper discoverer 235x60x18 and I usually inflate them just above 2.7 bars. I believe in USA you use PSI units for air inflation so 2.7 bars equals 39 psi I believe. Correct me if I am wrong.
 

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I keep mine at the standard 36 psi. Typically I only carry myself and one other, and all my ski gear. My winter tires are Yokohama ig51v 255/55R19. Previous summer tires were Toyo Proxees of the same size. I had those at 39-40 psi. The Volvo door panel sticker recommends 36 psi, I think that equates to 2.5 bar.
 

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Summer 36-37 psi.

Winter: to about 40 psi inside my garage, which will get down to about 36 psi once the car sits outside at temp -10C or so.
 
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