Went to even out my tire pressures today. I found out the other day there is an update frequency between the TPMS readings on the dash and the actually tire pressure, so I bought the Accutire key chain model to get an instant reading. Looks like the Accutire was about 1-1.5 lbs higher than the readings in my car. The Accutire is digital and I thought I read somewhere that it was accurate, but from what I'm seeing either TPMS is off or the gauge is off. It almost looks like the TPMS is compensating for the heat of the tire. Can't these things be a little simpler...