TPMS not at all accurate

[Calson]

The original intent of the feds was to painlessly (for vehicle owners and for the manufacturers) increase average fuel economy by alerting drivers that there tires were underinflated. Under inflation increases the amount of fuel that must be burned to move at any speed. This is not obvious to someone sitting in a car or truck as it would be quite apparent to anyone pedaling a bicycle with underinflated tires.

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[SALEEN961]

My TPMS sensors seem very accurate, when I first start my truck in the morning I either have current readings with the side facing the sun being slightly higher, or I have 3 dashes in place of each number. When I get 3 dashes in place of each number, it normally only takes 1/4 mile for all 4 sensors to start reporting the current tire pressure.

I think the big issue is that most tire pressure gauges aren't properly calibrated and I don't know anyone who checks the calibration or corrects it on their personal gauge. I have taken the time to do this on my own gauge, and I find that the readings it displays are accurate within 1psi across the 30-80psi range I use it in.