Three years ago today I got a Mk3 1.3 EX CVT.
In first year I drove 8,500 miles at 52.6mpg (57.5mpg indicated).
Second year 7,800 miles at 55.1mpg
Third year 6,500 miles at 55.1mpg
Overall 22,700 miles at 54.1mpg, almost all with supermarket E10 petrol.
The above are "true" mpg, fibometer values are typically 5mpg higher.