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      03-18-2019, 01:18 PM   #1
GeorgePowerFinch
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Question BMW 420d Fuel Consumption

Evening all,

Recent got my BMW 420d M Sport 190BHP 2015, second hand at only 31,000 miles , a lovely upgrade from my old BMW 316d 2013.

One thing I noticed was my 316d was incredible on fuel, pushing 50MPG+ urban and averaging 500+ miles minimum urban and well over 700+ motorway.

Since owning this 4 series I've struggled to hit 35+ urban and 45+ motorway.

Is the 4 series generally a more thirsty car? There's only 80BHP difference and still a 4 cylinder turbo diesel.

I'm an amateur so apologies!
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      03-18-2019, 02:05 PM   #2
lacrimarum
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This 80 hp difference is also 70+% increase in power, and more powerful engine naturally consumes more fuel
35 mpg urban and 45 highway seems to me as a very good result for 20d.
I guess there is no difference in fuel consumption between 3 and 4 series as there is no significant difference in weight, and drivetrains are similar.
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      03-18-2019, 04:55 PM   #3
zeikei
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My 420dx with same B47 engine drinks during winter 6.8 l/100 in my urban mixed everyday use and best long distance consumption that I have seen was 5.0 some weeks ago. Those translate to UK mpg 41.5 and 56.5 I think.

Those are idrive numbers though, I have not calculated the real consumption.
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      03-19-2019, 02:52 AM   #4
Derek Mc
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Generally it is a great engine but I do know from others that it is a lot thirstier in winter for some reason. In my last BMW diesel a 520d I averaged 55mpg incredibly a 2009 example with only 27K on her.

I do know of a few folks that manage a 50mpg average but not much more,,,
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