I haven't even got my car yet to see how I go, but I've already got fuel economy envy! Wish this thread had started sooner - might have swayed me towards the 320d. In gear performance is close to the 328i.
I did start a fuel econ thread but might have thought about my question a little more carefully.
328i aus spec |M adaptive suspension|sunroof|sport seats|self parking|extended display | aftermarket sound insulation