Just a quick average MPG update with my car now having completed 8000 miles. I've averaged a real world 28mpg across 6600 miles since keeping a record. I'm regularly seeing 34mpg on the DIS commuting runs - well up on the 31ish in the first 5000 miles so it seems. The RS3 is run on super plus (98/99ron) just for clarity. Even on the most spirited on road runs over a decent (30+ miles) distance a real world 21 -23 mpg is still realistic.
I know it's not something that matters much with an RS3 but always useful to know the reality from real owners, and I think these are good numbers for a car with this much power - certainly 10+mpg better than similar power Impreza's or Evo's and in my experience about the same as 200-270bhp hot hatchery.