On Fri, 9 Jan 2015 06:30:01 -0800 (PST), wrote:

N8N wrote: "It has but I would not rely on it unless
you have an actual pressure readout in real PSI.
a "Low Tire" warning just means that the tire has 75%
of the door sticker pressure, I'd prefer to know before
that point. "


Lucky you! The TPMS on my car were calibrated to
-5psi below the maximum pressure on my TIRES(41psi).


My door sticker says 30psi all four, so even if I keep
them at 32psi, my tires are still 'underinflated' according
to some guv'mint gadget installed in them! So I
just drive around and ignore the light.
Mine have a calibrate button (in the car) that you press when the
tires are inflated to my desired pressure. You act like your 41psi
calibration is set in stone. Are you sure?