Now I think I know why my mpg has been so good

Best ride I ever had was a 84 Sedan Deville.

 

I was told that hot weather and heat from driving will raise tire pressure 1psi for every 10 degrees. If you check your tires while they are cool and in early morning, by the time the afternoon comes and after driving a while, tire temperature can raise 30-40 degrees. this equals to 4 psi higher. so if you are sitting around 40 psi normally, then you are running at 44 psi during the heat of the day. A good rule of thump that I follow is keeping it at "cool" setting 4 psi under max pressure on the sidewall. btw, I have an 08 and been looking at the 2016 for a while now but have not made the "jump" yet. I've been consistently getting low 50's mpg on my 08 on mostly city driving.

 

Yelp, If I am on a trip I run 42-44 all around do to cargo. But around town 40ish in the back is a great number.