I'm not understanding several of the repsonses. The original poster's issue was clear.
Driver's don't expect adjust the air in their tires every few days/weeks. So if an area routinely sees temperations fluctuations of X degrees (maybe 30F?) in the course of a few weeks; then it's important to have a TPMS system that does not trigger within that fluctuation range. Presumably this is safe since auto manufacturers need to design cars to operate within these climate fluctations knowing that most drivers don't adjust their tire pressure weekly.
Given the information about the thresholds and accuracy of the TPMS system; one could calculate the ideal pressure for the tires at a given temperature such that the TPMS will not trigger incorrectly due to the expected temperature fluctuation (assuming that no gas has actually escaped from the tires).
Supposedly N2 would support a wider temperature range; but I don't have any first-hand knowledge of that and there's already a whole thread arguing about N2 versus air
So I think the question is whether anyone has any useful information or firsthand experience with regard to the actual thresholds for the TPMS system; calculating the ideal tire pressure; real improvements experienced with N2; etc. If the thresholds for the TPMS are too tight and cannot be adjusted then it's a design flaw from Mazda; if not then owners just need more tuning information to get their tires adjusted appropriately.
I'll go RTM and see if there's anything interesting...
-Jeff