My un-modified S3 will get 31-32 mpg easily on motorway driving, I got 34mpg!! (according to the trip computer, which is normally optimistic by about 1 mpg) and that was just cruising between 90 and 100, occassionally dropping a gear to overtake etc. So well happy with that! Normal everyday driving I get about 26.5mpg, which leaves me with about a 370 mile range, but with over 400 easily achievable.