I learned something the one time i payed attention in science class! In the winter when it is colder out, the ait molecules move slower, therefore they bounch off your tire walls less often making it look like there is less air in the tire than their actually is. When the weahter warms up, these molecules will move faster, therefore hitting the tire walls more often and expanding the tires....SO! makes sure you dont put too much air in the tire during the winter, because this air will expand when it gets warmer and could over inflate your tire....just my 2 cent worth
_________________________
1997 Pontiac Grand Prix GTP-pretty much all stock-Street Scene Grills, hood bra, yellow painted callipers, and a great sounds system!