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A further observation... I've noticed when discussing real world mpg figures, some comment on how low a figure they get while cruising, compared to another user in the same model. (A lot of 20d users do seem to report low mpg). I suspect if there is an issue with the car itself, it is most likely EGR that is at the centre of the problem.
It is not a new thing, EGR has always been responsible for some mpg issues, when erratic or faulty. Perhaps BMW know more than they are letting on, the 'quality enhancement' is quietly checking and hopefully sorting the problem.
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