I think we all know the quoted numbers are rubbish..
However it doesnt explain why a 4 Cyl 272ps turbo is way less economical (not just some of the time, but all of the time) than BMW's 306 BHP 6 cyl 3.0 turbo ? Mine was a coupe with manual box not the later M135i.. Yes the TTS is quattro but not permanent and the TT is part aluminium so no heavier than a 1 series coupe..
In the GTi, tuned at 230 PS, I dont see why that should easily do high 30's regularly its only a 2 litre after all ?