I'm probably being OC but I live in AZ and check my tire pressure daily before I drive. Not manually but I look on the dash before I drive and usually if I drove it the day before I have seen a drop as low as 27psi which I have confirmed manually with a tire pressure gauge. I filled it back to 30 when I saw it at 27. I know that in cold weather your pressure may drop and in hot weather it increases. As I'm driving the pressure is 30-33. Is it normal for it to fluctuate like this? Again I'm probably being obsessive compulsive for I never tested my tire pressure in other cars but I was a civic driver for the last 20 yrs! I'm not getting a warning that they are too low but just want to make sure this is normal. Thanks.