What is everyone's experience with the TPMS? I just had winters put on the car (X-Ice, EX Prem) with new TPMS installed on steel rims. Next morning I checked the pressure in all the tires (twice) with two different gauges, both reading 36psi. The TMPS gives me readings of 38-40?!?!? Is this normal? Before putting on the winters, I just assumed the TPMS readings were accurate.