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      01-27-2015, 12:40 PM   #23
gspannu
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I suggest that anyone who really wants to measure their true mpg, go for the brim to brim route.

Do not be surprised if the actual brim to brim figures are significantly lower than what is reported by the OBC.

A difference of over 10% is not uncommon.
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      01-27-2015, 01:26 PM   #24
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I have just over 8000km on my MSport 520d and the long ter average is (OBC) 45.4 mpg. I changed from a F30 330d where I got average almost 49 mpg, and I wasn't driving it like Miss Daisy. With the lesser power in the 520 I am less likely to engage in more aggressive overtaking etc so maybe it's not loosened up yet. Before the 330 I had two F10 520ds and was over 49 mpg long ter on both. Typical driving in all of above was a combination of city and A roads. I do a 25 mile trip a few times a week and if I get caught behind HGVs doing 50mph the trip computer records up to 60 mpg. On motorways I,m lucky to get low 40s mpg average.
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      01-27-2015, 04:26 PM   #25
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Quote:
Originally Posted by gspannu View Post
I suggest that anyone who really wants to measure their true mpg, go for the brim to brim route.

Do not be surprised if the actual brim to brim figures are significantly lower than what is reported by the OBC.

A difference of over 10% is not uncommon.
Agree whole heatedly, I do think that mine must be reading quite high on the obc. There's no way I should be able to get 67mpg from a cold start. Will have to do a proper test.
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      01-28-2015, 03:26 PM   #26
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Not impressed so far

Have just traded my E46 330d manual which averaged 41mpg over 14000 miles measured brim to brim. My new 2011 520D SE manual fitted with M-sport alloys has just averaged 45mpg on a 330mile motorway trip. Cruise set to 80mph in quiet traffic. On the same motorway run my 330D would return 47mpg.
Over a 300 mile mixed driving conditions my 520d has returned 35mpg where my 330D was never under 40mpg. I was expecting quite a bit more.
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      01-28-2015, 04:01 PM   #27
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Ive had an average of 48mpg on my 2011 520d with sports auto, and thats driving conservatively over 8000 miles. I do about 1,000 miles a week, in all situations city centre driving, motorway, country the lot.
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      01-28-2015, 04:34 PM   #28
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Quote:
Originally Posted by youknowluke View Post
Ive had an average of 48mpg on my 2011 520d with sports auto, and thats driving conservatively over 8000 miles. I do about 1,000 miles a week, in all situations city centre driving, motorway, country the lot.
I'm wondering if the sports auto makes all the difference.

16,000 LCi without sports auto, and it is 44mpg max, even with eco pro.
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      01-28-2015, 04:56 PM   #29
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There are different power output and CO2 figures for LCI versus pre LCI, so you can't do a straight comparison.
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      01-30-2015, 11:51 AM   #30
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Quote:
Originally Posted by Piers View Post
I'm wondering if the sports auto makes all the difference.

16,000 LCi without sports auto, and it is 44mpg max, even with eco pro.
Sure is I had a thrifty BMW 520d MSport 63 plate lci brand new 1000 miles on the clock I put 20,000 miles on it in two weeks and it did 50mpg and I was driving it hard. not to mention it was an estate aswell!! Normal auto not sports.
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      01-30-2015, 02:04 PM   #31
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20,000 in two weeks? At 60 mph average that's 23.8 hours a day....

Piers - sports auto should make no difference. Biggest factors include tyre width and driving technique.
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      01-30-2015, 02:46 PM   #32
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See http://www.fuelly.com/car/bmw/520d
Not a definitive source but it does seem that 520d fuel economy on average is getting worse over time.
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      01-31-2015, 12:56 AM   #33
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With only 4 2014 cars reporting, and they range from 38 mpg to 47.5 mpg, the data is definitely too dodgy!

If you look at all F10/F11 520d's at spritmonitor, they have 202 cars with an mpg histogram like this:

Name:  2015-01-31_06-46-52.png
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http://www.spritmonitor.de/en/overvi...0d&powerunit=2


If you filter further, and look at 2010 to 2012 cars you get this:

Name:  2015-01-31_06-52-47.png
Views: 1151
Size:  7.5 KB

and 2013 to 2015 give this:

Name:  2015-01-31_06-53-07.png
Views: 1152
Size:  6.3 KB

you can see that the average is more or less exactly the same (42.66 and 42.18).
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      01-31-2015, 01:05 AM   #34
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It's worth pointing out, though, that spritmonitor is european, and many of the respondants are German. Who have a different speed profile to British drivers.

I always look at the upper part of the main bulge in the histogram. So in this case, 46 mpg would be about right for the average British driver.

Of course, if you are on and off the brakes on the motorway, and like to use most of the performance every time you accelerate (BMW salesmen, are you listening?), then subtract a whole load - or just look at the bottom end of the histogram (36).
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      02-03-2015, 11:07 AM   #35
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Quote:
Originally Posted by Johnny Grabble View Post
See http://www.fuelly.com/car/bmw/520d
Not a definitive source but it does seem that 520d fuel economy on average is getting worse over time.
There are at least two aspects to take into account before reaching a conclusion regarding the yearly list you pointed at.
Firstly, that the number of car is very small and therefore the average quoted is not very reliable.
Secondly, new cars tend to consume more. It takes at leasts 10,000 miles to reach the optimum consumption. So, it is not surprising to find that the 2014 cars seem to consume more.
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      02-26-2015, 02:28 AM   #36
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Ok, final post on this from me. Exciting I know! 70mpg today from a cold start, nothing short of amazing. I've also done some checks at fill up to see how accurate the trip computer is, I recon it's reading about 1mpg too high.

[IMG][/IMG]
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      02-27-2015, 03:47 AM   #37
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Quote:
Originally Posted by CraigUK View Post
Ok, final post on this from me. Exciting I know! 70mpg today from a cold start, nothing short of amazing. I've also done some checks at fill up to see how accurate the trip computer is, I recon it's reading about 1mpg too high.

[IMG][/IMG]
Do you live at the top of a very long hill?
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      03-03-2015, 03:46 PM   #38
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Quote:
Originally Posted by CraigUK
To continue this boring thread, I was bored this morning on my way to work and tried to see what I could eek out of eco pro mode. How sad! Impressive all the same though

[IMG][/IMG]
In my 530d 2011 I seem to be getting around 37 mpg average or approx 550 miles per tank when calculating brim to brim. Majority of the time the OBC is under-estimating, as usually in the morning and evening I'm getting between 34-35 in my rush to work/traffic. An Eco run highest I have done is 43 but not had a long journey yet.

The long term average over 3000 miles I have owned it, is 34.4mpg but again I'm sure it's a lot better.

I have doubts about not saving a tad extra for the updated 2012 Eco-pro model with RTTI Pro-nav but I suppose that's probably £5k extra which I would never get back in fuel or make a huge difference travel wise on the same routes.
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      04-17-2015, 04:25 AM   #39
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I think this dull thread has been sleeping for too long.....

More MPG boredom, 535d:

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      04-17-2015, 06:59 AM   #40
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Quote:
Originally Posted by Pottsy View Post
I think this dull thread has been sleeping for too long.....

More MPG boredom, 535d:

Truly impressive figures for such a machine. I've got a 72.4 mpg shot but I refrained from posting it
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      04-17-2015, 07:42 AM   #41
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58.8mpg out of my 2011 520D, 400 odd miles with 54mph average. The car has nearly 99k on the clock and it seems to get better and better as time goes by..
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      04-19-2015, 05:15 AM   #42
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I need to check this out on my 530 too. It is incredibly economical for such a big car but bares little resemblance to the official figures that are acquired in fantasy-land.
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      04-19-2015, 02:06 PM   #43
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I don't like this thread.
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      04-20-2015, 01:52 PM   #44
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On a recent trip to Holland my OBC was showing 58mpg when averaging 65mpg and 51mpg when averaging 85mph. 2014 520d M Sport.
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