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I'd still get a gauge and check the tires. If you have a full-sized spare, check that too - just in case.We took off, and the TPMS didn't reset, and the readout still said 18 pounds. ... It keeps going down, too; when we got home it was reporting like 14 psi. It's not any other tires either, we looked and I'm sure even w/o a mechanical gauge (which I could not find when I wanted it of course) I could tell if a tire was down to 14 psi from 35.
From the symptoms you're describing, I think a tire is going flat. But the car wasn't reset after the last tire rotation, so it's showing the wrong tire.