Is the BMW Sport Steptronic's fuel economy as good as is claimed?

BMW 320d Sport Steptronic - is the fuel economy as good as they say? I'm looking at one tomorrow.

Asked on 3 October 2012 by DM, via email

Answered by Honest John
The tested economy figures at www.honestjohn.co.uk/realmpg show: EC fig: 53.3mpg; average fig: 43.9mpg; range: 38.9 – 47.8mpg.
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