Again non PP GTI, but for the 3000 miles I've owned it (since may), my average according to Fuelly is 36.3 mpg although I do expect that to drop a little now the colder weather is here.
My trip to work is 10 miles though a town centre in the morning, and approx 14 miles on the motorway on the way home (due to traffic conditions). My MPG going to work (from stone cold) is around 32-35mpg (depending on traffic lights etc) and around 40-45mpg on the motorway on the way home, (with over 50mpg once in the summer).
By contrast my GTD's over the same journeys would achieve around 38-42mpg in the morning and around 48-55mpg in the evenings. My overall on Fuelly for my last GTD (tracked over 16k miles) was 45.2 and my first MK7 GTD (over 23k miles) was 45.9.The GTD's really didn't like the cold weather. Will be interesting to see if the GTI is affected as badly once the real cold weather arrives?
Bear in mind as well all 3 of these cars are DSG, so a manual should be little better.