Well my 2.0 was ok. I had it from new and did 75,000 miles in 3 years with only a water pump impeller letting me down. It used 1 litre of oil during the first 10,000 miles, then less and less until it used none at all between the 60-70k services. I can't remeber what it was like on fuel. I replaced it with a Leon Cupra, so know all about the 1.8T.
As I said before, I had chance to compare the performance of the 2.0 and 1.8 20V and despite how they felt, there was nothing at all in it. The reason behind changing to the 2.0 was all to do with emissions.
If I had that time again, I would have saved longer and bought a 1.8T, but I didn't and that's that.