I inflate my tires to their max pressure and sometimes 2-4lbs over that. My father runs all of his tires at around 52lbs, regardless of what they say on them. I'm willing to bet that he gets more life out of his tires than anyone here. I know his always last longer than mine do. He's an old timer and he's figured this little trick out over a very long period of time, and by having at least 30-40 tires in use at any given time here on the farm..