Actually it's not so much a particular pressure that affects it but the difference between the tires which is judged by the rotation of the tires. so you could have them all at 28 pounds , do a reset and it would stay green until one of them dropped pressure, so far I have seen a three pound difference do this and also when it was five pounds lower ( although that was due the value stem nut coming loose and loosing lots of pressure).
I agree with you I want to know when it's 1-2 pounds down, I have air compressor in the garage so keeping the pressure right is not hard. I'm running RFs which don't last very long anyway so I would like to stretch their life as much as possible.
I too find it odd that somethings are high tech and other so olden days.
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