Not had a 163, but in my 177hp ED, I've averaged 44.3mpgs over 2k miles with a wide variety of driving; back roads, commuter crawl, motorways, weekend sprited drive, etc etc.
2014  M135i, 3dr, MG, Auto, SP, CP, HS, HK and FBP
2011  Abarth 500, Funk White, Leather, H&R
2007  320d M-Sport Touring
Pre 2007 - GT TDI 4MO, Mk4 R32, A3 TQ, A3T, Cupra R and on and on and on.....