I'm not talking about having a 'lead foot' rather which is better for fuel efficiency when pootling around town ...
A) Keep the car in a lower gear, just enough to be in the range of the turbo spooling up and actually doing something?
B) Select a gear so that the revs stay below the turbo range?
Just recently I've been keeping my car in 4th (and just in the range of the turbo) when around town doing 30/40mph and this seems to yeild better results than putting it in 5th (still not 'labouring' the engine) and staying just below the turbos range.... or it just may be my imagination!!
Anyone got an answer/opinion?