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Both sets of my snow tires are also rated for 51psi so I keep them at 50psi.
From the studies I've read about tire pressure, higher pressure gives better traction on snow, ice and wet pavement, my owners manual also suggests bumping the tire pressure up for any highway driving and I have nearly 30,000 miles on my snow tires, so they are nearly wore down to the wear bars and the treat wear is dead even, no bald ridge down the center like people fear with bias ply tires that were popular from the 1800's to 1970's.
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