Alert came on so I checked the tires and they were all the same 27.5 psi. Have had the MKC for a few weeks, put about 500 miles on it. Door sticker says 35 psi for front and rear tires. I went with 32 for now. Anyone know why the dealer would have put them at 27.5? Could the alert been because the weather got cooler and the pressure dropped just enough to trigger it? Once I brought them up to 32 the alert went off. What psi are you running in 20 inch tires?