Doorpost and Operators Manual recommendations are compromises for undocumented reasons. I believe Max inflation imprinted on the tire is a better guide.
I have had the best results in fuel economy and tire wear using an IR temp gun to scan across the tire surface and adjust tire pressure to achieve a uniform temp across the tread after a half hour of operation. It often requires added pressures on loaded vehicles and ocassionally lowered pressures on empty vehicles.
Starting with Max pressure at the max load on the tire sidewall and adjusting to the same proportional pressure per actual load seems to be a good place to start rather than the pressures for unlisted variables that are on the door post.
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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