If anyone's really worried, hope my experience reassures you.
I have an F10 520A. First 5000 miles I was struggling to get 40+ mpg as the actual (measured rather than computer) - though on long hauls it was relatively easily to get the computer to report 47-50mpg.
It's noticeably increased since around 10,000 miles
I've just completed 20,000 miles. I'm averaging (without trying, and occasionally driving pretty aggressively) 51mpg (again measured, not computer), and can easily get the computer to report 55-57mpg for a tank.
Given I appear to need to get a bank loan for every single fill-up given current price of diesel, for this I am very grateful!
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