You don't get good mileage until your done about 10,000klm and could take even longer. Also it won't be due for one but change out the air filter at 10,000klm.

You will be suprised that by that change alone you will get better economy. Apparently BMW only changes the filter after the 3rd service and that is to long. With turbo's there sucking a lot of air and with that all the city crap straight into the filter.

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