Four little letters at the end of my post. You want to run your tyres at 27.5 psi no one is stopping you.
Recommended tyre pressures from the manufacturer are a compromise to make the car ride more comfortably. I've driven cars with tyres inflated with less than 30 psi. They handle like shit. I'd rather compromise some ride comfort and have the steering feel like it's doing something rather than the tyre feel like it's going to roll off thr rim.
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