Why are you guys trippin'? The tires are rated for 51psi, ie you can drive them for their entire 25,000 mile life expectancy with no harm to the carcass. Nissan, like any other rational person says use 35 psi to improve contact patch deformation and therefore traction.
Coming from the factory, the last thing you want to do is put 30 psi in it, then have a slow leak and have 50 cars with flat tires to deal with with when you're trying to unload 5,000 cars off of a ship in an 8 hour window.
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