I think the point of this thread is to post GOOD mpg results. People seem to have lost sight of that.
If you want to talk up how poor your fuel mileage is or anything other than just posting your BEST mpg/tank (and I don't think anyone really cares whether you get 12 or 15 mpg in your work truck... if the number is less than about 30, you're wasting our time)... I think you should start a new thread.
Even the mighty Yaris gets crappy fuel mileage at an autocross! That's a topic for another thread.