An hour into my trip driving under "straight and level" cruise control conditions, the TMPS warning came on. On closer inspection I found a 1 psi difference between the rear tires. Even after the tires were cooled down the tire with the lower pressure was at 30.5 psi, the other side was at 31.5 psi. The fronts both registered 32.5 psi. Two questions: (1) Would the TPMS be that sensitive? (2) Would the OBDII data for TPMS identify the suspected tire?