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My low pressure warning came on at about 27 psi when I was driving down the freeway. I'm actually pretty glad that I had the TPMS because it was a slow leak that I wouldn't have seen until it was too late. With the low profile PS3s, I couldn't see a visual difference between 40 and 27 psi; when I got out to check, I thought it was a false alarm. But when I got home and checked with my digital gauge, the TPMS was right.
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