With 1.6 tdi you should make like 500 miles hah.. I have 2.0 and I make 370 - 380 miles Even mine is weirdly less but around same every time i do top up.. But when I had a3 8p I think it was showing more precisely was calculating better
But I top up every two weeks so..
It doesn't matter as 8p or 8v is still very similar.. I've seen this your question matter already long time ago and was telling my self that quad exhaust is just for the look.. Two and bigger (like rs has) would be completely enough