What Tire Pressure do you Run in the Winter?

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2015 Mazda 6 -- Skyactiv 2.5L NA W/ 91 Octane Tune
Mazda states to run a pressure that's 4PSI higher than what's stated in the door jamb in the winter.

Do you do this? What pressure do you find works well for cold/freezing temperatures, especially when dealing with slick conditions?
 
Hmm, I've always filled to about 36 psi for my CX-9s, which is 2 PSI higher than what is recommended on the placard. Never had any issues. I only chose 36 because 34 felt a little low to me. I'm interested in seeing what others do.
 
Will be putting my new (To me) Mich. X ICE XI3's to good use this winter. Will play around with PSI and report.
 
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