I was wondering what everyone is actually inflating their tires to? I have nitro in my tires and my car has 6000K on it and my TPMS light has come on twice. I think I figured out which tire it was was i have been fillin with regular air even though I have free fills at the dealer. I think I have a small nail or somthing in my tire. My first oil change at the dealer I will have them look at it and refill all tires with nitro again. I filled them today to 40 FYI.