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Factoring PSI has many variables which are mainly based off of the load index and sidewall construction.

If you're running the OE tire size with a tire model that has the same factory load index, the recommended pressure listed on the door placard is a starting off point and is used mainly for comfort. You can bump up the pressure for better fuel milage but you'll want to keep an eye on the tread wear. Higher pressure can wear the center of the tire faster if the PSI is bumped up a significant amount.