RTF... I track my mileage on
www.fueleconomy.gov all the time. Mind you, I am in FL where virtually all gas is 10% ethanol, which reduces mileage, and I drive with A/C on 11 months or so out of the year. And for the other month, it's still probably 50% A/C usage. So my mileage is probably a tiny bit low.
My best tank so far has been on a round trip from Tampa to Orlando, about 250 miles total, including some in-town driving. I was just shy of 25mpg. My worst was just under 21mpg on a tankful with a higher amount of in town driving (more like 40/60 instead of my usual 70/30 highway commuting tanks). I also drove it HARD on that tankful, just to see how low it would go.
Since September, when I bought the car, my overall average, which is usually a 70/30 hwy/city mix with A/C on 90% of the time, is 23mpg.
At the moment, since it appears the weather has cooled as much as it is going to for a while, I am 2 days into a tankful where I am trying to drive gently, cruise as lower speeds, and not use the A/C except to defog the windshield. I just want to see how high the mileage will go.
Side note: I have a friend with an MS6 (same engine, but AWD) who says he has gotten 27 out of his on occasion. His daily round trip commute is in excess of 100 miles, whereas mine is just 55-60. He also has a decent amount of mods, but I forget if he has any engine management or A/F mods. Was planning to ask him after I get this tank's mileage results.
And I gotta say.. man, it is hard driving like a granny. I'm nowhere near true hypermiling, as I do NOT have that kind of patience, but I'm driving the MS3 like a frakking K-car on a grocery run right now. I oughtta be drugged.