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      06-09-2016, 05:20 AM   #6
dangerous_al
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Drives: F30 LCI 330i M Sport
Join Date: Apr 2009
Location: Bristol England

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You should take the on board computer figures as an estimate only as they do tend to be a little optimistic by a couple of mpg. I have applied a correction factor to mine but it is still not totally accurate. I have a 330i with 6k miles on it. The other day I did a 220 mile trip mostly motorways but some A roads and returned 49.8mpg which is outstanding. On a run it will easily achieve mid 40's and is as you say getting better, but around town it kills it, with short journeys really punishing it down to mid 20's, so it really depends on the type of journey. My calculated overall average from new is 35.9mpg which I am very happy with
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