Working at a mechanic/tire shack, I do all my own tire work. And from my expreince, cars will usually drop 5-10 psi when the cold hits, and 10-12 psi on a tire running 80 psi. Get the heaviest ply possible, I recommend those for two reasons, more plies ALWAYS means less flats and 10 ply tires almost always have more tread depth than 6 or 8 ply tires. Avoid bias ply, nail magnet and horrible tire life. And don't rely on those dam tire sensors to save your tires ! About 9 out of ten times when someone comes in with a tire light on its a false alarm fixed by setting tires to the same pressure. Buy a good quality gauge, I would recommend Milton brand, and check them often. And btw, to those mr armchair tire experts, you can't "eyeball" tires for pressure and get anywhere close, trust me it's impossible, checking with a hammer, with much practice, is possible but your eyes aren't that good. And for the love of god put those f&$$ing valve caps back on when your done airing or checking a tire.
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