We have a TMPS(TST). We just got home from a trip to Alaska, travelled on freeways, secondary roads, and gravel,dirt and rock roads,on and off ferries, sea level to much higher elevations. Relied on TPMS and never touched tires until just now in shop. Was interested in seeing if system was as accurate as it was reading. Checked every tire with electronic gauge used when filling tires before leaving. Only variance was ambient temperature in shop, now 78F and 68F before starting trip. All tires read about a half a pound higher than before trip and all TST sensors read 2 pounds lower (same as before), impressed with both the TST and the tires