I know this has been done before so spare me. I am however going to personally take some of this sites bandwith to log my average MPG with my STI. Much easier then a PDF and everyone who cares can follow along to.
I have most of my MPG's from my 2006 in a simular thread that I didnt start.
So far on the first fill up I was able to get 21.3 mpg average. Little to no boost but mostly around town driving.
Second tank with a backroad detour still very little boost but more throttle I was able to pull 22.4.
Third tank with mostly a highway run (about 160 miles) in sixth gear at 65-75 mph (had to vary RPM's due to break in) got a great 24.1 average. The last tank had some backroad driving but most of it was that highway ship.
So far I am rather impressed with the car. Hopefully after the dealer reflash things will only get better. I have a feeling once the car is broke in I could easily pull 24's around town and 26-27 on the highway.
For the record I use the same gas station, same gas pump, and around the same time of day for each fill up. Oil is also checked at each fill up and so far no consumption that I saw.