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Hiya Marc and welcome

That sounds a bit low to me, I usually manage 31-32 ish but that's mostly on duel carriageways (I use my Mrs' car for all the running around town - that's what it's there for! ).

for town driving i would say thats about right, although mines a d8 2.0 16v, its essentially the same engine, i struggle to get 23mpg

i done all the maths on mine and i get 34mpg
petrol purchased miles travelled etc