Quote Originally Posted by Mario Kadastik View Post
Well as I mentioned I actually had them fill it to 3.0 even though the placard said 2.9 so I was having a bit more air in there. If the warning went off at 2.9, then with a temperature drop 10C you'd have the warning on immediately. Yes you should probably refill to account for the lowered temperature, but then it'd be wise to also release some when the temperature rises 10-15C again. Noone's going to micromanage like this therefore a bit wider safe variation should be tolerated and yes people should fill to higher pressure before winter because the temps will drop.
Of course, no one micromanages it. In the winter you set the pressure based on the lowest temperature and in the summer the highest. The idea is that you don't let the tires go below the vehicle placard setting for normal driving.