For future reference a better way to measure your true gas mileage is to fill up to the first click of the pump and stop every time you fill and reset your trip meter every time you fill up. You can do simple division with the number of miles on the trip meter and the number of gallons you pumped in to get your mileage, which is a hell of a lot more accurate than going by "tankfuls" (huge margin of error because you never run it fully dry). I've already noticed problems that caused poor fuel economy, fixed them, and noticed the fuel economy improve 2-3 mpg by using this method. Brought my mileage from ~12 mpg city to ~17 mpg city through a few tweaks and small fixes, this in constant hard driving and boost.