Nitrogen is what i use in my xf tire. Many places offer this for a small fee some charge nothing. I have heard some dealers charge 150.00 dollars. Nitrogen should keep your tps sensor stable. Because it is not affected by temp. I believe that nascar use nitrogen. I have my own nit tank and regulator.so it is easy for me. You should not mix nitrogen with pump air if you want to maintaine the benefit of nitrogen. Nitrogen will leak out over time just like air even if you do not have a punture. So if you are not doing high speed driving say 90 are above for long periods , air should be fine just keep the pressure right. Nitrogen maintains a stable pressure at all tempertures which will keep your tires at correct pressure at any temp . I feel my tires are safer with nitrigen so thats my thouhts. OMG I am going to shut up!