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I can't talk for others but i compare a 120d with 320d, same area, same driving and same style and the 320d is around 20% worse. The only other difference being the cold weather (and the fact that the 320 is heavier) but it's not *that* much colder than normal (around here anyway).
The 320 is older and higher milage, so the MAF conversations could have something to do with it. Im unsure how i'd go about finding whether this is a cause without taking it to a garage.
It's not the end of the world, but if i can get better milage that would be great, 20% over the course of a year can make a fairly big difference. Well it could pay for a new MAF for sure...
And gizze, it was a manual 120d so as you say can't really draw comparisons to an auto which i've never had or driven!
cheers
paul
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