Slow leak
I have lost 25 lbs of air pressure in one tire in the past 6 weeks or so sitting in the driveway . Turned on the TPMS to check for the upcoming trip , and three were 102 psi. , the low tire was 77. ...
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Had a similar issue in a car tire. Lost 10 pounds over three months. Every three months. Nobody could find it. Had the tire removed so I could spray the interior part of the rim with urethane in case it was porous. Took off the valve stem -metal with a tpms sensor- and found a very fine corrosion line going between the wheel and the rubber part of the valve. Cleaned the valve and rim and put it back together without spraying. Four years and no air loss. We had lived where a lot of salt was used. Now the only salt is on the food. Annual average snowfall went from 93 inches to .05 inches a year.
