Temps dropped to teens. Tire warning came on so since I was in town I went to tire shop and as soon as I drove in one of the techs said "Tire pressure light", yep it that common an issue. He checked all four tires and they were all similar so a leak was not indicated. He put them all to spec and double checked with some gadget, no charge but I tipped him. He said most sensors are sensitive and going from over 100 to teens in a few months exasperates the issue.