Hey man I don't know how your getting your MPG but I know that in my Nissan Pathfinder manual for some reason it says that my tank is both 20 gallons and 17 gallons? I don't know why it would say that but when I go to the gas station and fill up it takes 17 gallons so maybe you are using that higher number from your book and getting a worse mpg then you really are getting?
