The instinct to floor it is exactly wrong — it digs you deeper and polishes snow into ice. Slow is your friend here.
Around 15-20 psi gives a bigger footprint that floats on sand or snow. Air back up to normal before driving at speed.
Spinning tires dig deeper in sand and mud and polish snow into ice. Slow, gentle, straight movement gets you out; flooring it buries you.
More tips: · Make Creek or Rain Water Safe to Drink With No Power · Stop Bad Bleeding and Treat Shock · Running Your Car in Snow · Communications When the Grid Goes Down · Keep Your Phone Alive in the Cold · Your Freezer Is a Grid-Down Food Vault · Jack Up a Car Without Getting Killed · Stay Warm With No Power (Without Carbon Monoxide Killing You)
General preparedness information, not professional advice. For medical, structural, or dangerous situations, get real help when you can.