I fill my tires up with Slime to the correct pressure, all this talk of air and Nitrogen is BS.
I got snow tires on my Fusion a few weeks ago and they tried talking me into the Nitrogen. What a scam. If you can't adjust the air in your tires for different temps, you have no right driving a vehicle IMO. Basic maintenance like looking at your car before driving it should be mandatory, all of this TPMS BS should be thrown away. If you are too lazy to check air pressure and get in a wreck, that's your fault. If you are driving and can't tell if a tire is losing air, you need to hang up the keys.