The big difference is the water content...
The water vapor in the air in our tires has more to do with the pressure variations than anything. Humidity here runs 90% in the summer...
Water expands ~1600 times in volume from 0 to 100C.
Water vapor in the air is concentrated in the compressed air, unless you have a dryer in the line, like for a paint booth.
Nitrogen out of a bottle is dry; (otherwise it freezes coming out of the regulator) so less expansion/contraction. But it only works if the tire is mounted and backfilled with nitrogen, otherwise there is a lot of standard, humid air in there...
Easiest answer: Fill your tires when it's really cold outside, so the humidity is low!
Red '96 Cougar XR-7 240k mi. '02 4R70W, PST DS : '03 PI engine, 04 maf, 24lb injectors, 2.5" exhaust, '02 4r70w + Jmod, DirtyD0g TC + cooler + 3/8" lines, 255 walbro fp. Alpine system.
Black '96 Cougar XR-7 (Lazarus) 210k mi PI Intake, '02 4R70W, Jmod, PST DS, GrogTune, Konis, Mark LCA+Poly, racecougar Custom Engine Chain, and JL and racecougar Bracing.
Black '97 Tbird Limited Edition, '02 4R70W, 255 walbro, PST DS, PBR Brakes&SS lines, Toicko Blues & Springs, GrogTune.
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