tire pressure

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?

I own a 2015 Mazda 6 that does not tell me my tire pressures. It has an older style of TPMS that simply alerts you if one of your wheels are spinning faster than the others. I bought one of these: Fanttik X8 Apex Portable Air Pump & Tire Inflator Here in Canada, temperatures fluctuate...