[snowblind]

You may indeed be onto something. One thing to consider. Has your pattern of stop/starts changed? Each start makes a dent in the mpg average. This is partly why lots of short trips have such a negative effect on mpg figures.

 

[snowblind]

You may indeed be onto something. One thing to consider. Has your pattern of stop/starts changed? Each start makes a dent in the mpg average. This is partly why lots of short trips have such a negative effect on mpg figures.

 

[e61paul]

you need to get the car read and see how often it regens
a regen uses a lot of fuel for no milage so the figure will drop dramatically if it regens to often

 

[SDP79]

Thanks for these replies.

Driving is a regular 25 miles each way trip on duel carriage way for my wife to work. Can get a bit bogged down in queues of traffic but this was the same for my previous car so the driving manner and conditions have not really changed at all. Old car would return around 54mpg like clock work!

About a week ago I did a 40 mile round trip on A roads and drove extremely cautiously. Computer returned 47mpg for that trip. Other than get out and push I really do not know what more I could have done to improve mpg. 60mph tops and no sport mode. My aim was to get the best possible mpg as an experiment and this is not how I would usually drive, again in my old car I would have expected and achieved 55mpg+.

My understanding of the regen is that it should happen fairly infrequently if the vehicle was doing regular long trips which I take to be over 20 miles.

I have done 150+ miles of continuous motorway driving with no holdups and using cruise control at a steady registered 70mph (which in real terms is less that 70mph). This has returned less than 50mpg. My old car showed 62mpg on a similar run! This is exceptional I know but it was ideal motorway driving conditions - dry, no high winds and very little traffic, only two people in car and no heavy loads.

There has been a comment about a certain amount of running in and this is what I am hoping, but am skeptical. As I say this is a brand new car with now under 5k on the clock.

1) My suspicions are that this regen is happening too frequently
Or
2) cruising in top gear is not being achieved on a regular basis when it should be.
Or
3) There is some software issue that is some how affecting fuel delivery
Or
4) I have bought a lemon
Or
5) A variety of combinations of all 4!

Thanks once again

 

[318Pit]

I am slightly concerned now - 520D MSport Auto due in April and chosen with an eye to the official figures being wrong but noting a colleague gets 60 mpg easily on a motorway run from his [N47] manual with the same spec. I'd presumed I could get at least 48 mpg average in my calcs so I'll now be looking very closely at what a B47 auto will do in real life. In my current Mondeo 2.0 TDCi manual [don't ask ] I get 48 mpg which beats the real MPG average by 5% or so and on the same website the 190bhp 520D F10 [is this the B47?] states 46MPG real average - hence my guess at 48 MPG for my new one. Time will tell!

 

[e61paul]

as mentioned earlier do a test drive brim to brim, volumes dont lie
cheers
paul

 

[The Big Bamboo]

I am slightly concerned now - 520D MSport Auto due in April and chosen with an eye to the official figures being wrong but noting a colleague gets 60 mpg easily on a motorway run from his [N47] manual with the same spec. I'd presumed I could get at least 48 mpg average in my calcs so I'll now be looking very closely at what a B47 auto will do in real life. In my current Mondeo 2.0 TDCi manual [don't ask ] I get 48 mpg which beats the real MPG average by 5% or so and on the same website the 190bhp 520D F10 [is this the B47?] states 46MPG real average - hence my guess at 48 MPG for my new one. Time will tell!

The B47 (released Oct.2014) is the new 190bhp engine in the 520d. Mine is 8-speed auto,…the same as the car you have on order.

My own figures, detailed in post #2, show my average for the past 12 months is 38.25mpg; however I don’t do a great deal of m/way driving,…very approx 15% of the total miles covered.

The Honest John website real-mpg figures for the ‘auto’ and ‘manual’ versions show no ‘significant’ difference between the two; indeed the 520d-190 auto returns slightly better figures than the manual version ,….which I find quite surprising. i.e. 46.0 & 44.7 respectively.

However, the BMW official EU test figures do state that the auto should return slightly better figures than the manual so I probably shouldn’t be surprised…(but I still am!)

I guess ‘open’ sites like Honest Johns RealMPG serve a purpose and can certainly be an indicator of comparative values, but one must always bear in mind that the figures are subject to the whim of the contributor.

There will always be a minority of contributors who, for myriad reasons, will enter figures that may not be as representative as they perhaps should be.

Some people use questionable calculation methods,… others can be very selective about which particular MPG figure they enter,… some will enter exaggerated figures for ulterior motives and there is certainly a number of MPG dick-wavers who enter exaggerated/selective figures for reasons best known to themselves.

My own average figure for the past 12-months is entered in the ‘Honest John RealMPG 520d 190-Auto’ section;…….38.25mpg…honest! :hihi

 

[318Pit]

Thanks for the replies - I'll report back in April in case it helps the OP and the debate generally!

 

[nashdm2]

Guys, just joined to contribute to this thread.

To a certain extent, it is very frustrating there are so many different forums out there as many of them are discussing similar issues and if they all "joined forces" there would be a greater level of debate. This issue being a great example.

In the old BMWland forum, there was a lot of lost data when it sadly had to shut down. This issue was discussed well on that forum.

I have recently joined the "forum.bmw5.co.uk" forum and raised a %@)d B7 fuel consumption issue thread.

Take a look guys, this is a real issue for sure and I am convinced it is linked to the regen process as other have suggested.

BMW 520d B47 Engine Fuel Consumption - F07/F10/F11 2010- - BMW 5 Series Owners Board

Regards, Dave

 

[DiscoNeil]

Mines the same, 2015 520d with the b47 engine, take a look at the exhaust blowing thread on here, mine regens on nearly every trip producing average mpg of around 38 which is well below the last 2012 520 I had. BMW main dealer doesn't want to know and say it's normal... No idea what I can do next apart from getting rid.

 

[edber]

mine regens on nearly every trip producing average mpg of around 38

38MPG aint bad if you are doing short trips.

 

[edber]

mine regens on nearly every trip

How do you know this?

 

[DiscoNeil]

38MPG aint bad if you are doing short trips.

It's a long way from the manufacturers stated figures, and no it's not short trips it's a mixture of motorway driving as well, the B47 engine was described as a step forward to the previous one but it's anything but.

 

[DiscoNeil]

How do you know this?

Well Edber, I know my car and the regens are obvious, take a look at the thread titled exhaust blowing noise on here as members have posted the noise it makes during the regen, it's awful. It does seem that some are experiencing the issue worse than others but it's BMWs complete ignorance to finding a solution that I think is the most frustrating. The repetitive regens seem to play havoc with the mpg figures.

 

[The Big Bamboo]

It's a long way from the manufacturers stated figures, and no it's not short trips it's a mixture of motorway driving as well, the B47 engine was described as a step forward to the previous one but it's anything but.

..the B47 is a deal more powerful, less CO2 emissions and the auto is quicker and more economical than the manual;..if that isn’t progress what is?

Now, if BMW could just address the very trifling matter of shite fuel economy then all would be well! :duh

 

[DiscoNeil]

..the B47 is a deal more powerful, less CO2 emissions and the auto is quicker and more economical than the manual;..if that isn’t progress what is?

Now, if BMW could just address the very trifling matter of shite fuel economy then all would be well! :duh

Only stating what a lot of other owners are also experiencing, yes the B47 engine is supposed to return better figures than the last engine which is why I changed mine but in my case and for a lot of others it simply doesn't, my last 520 was a manual and was about 10 mpg better. This new improved car sounds absolutely crap when it regens and the fuel economy figures stated are just plain nonsense. Not sure why you would doubt what other owners are posting, if yours isn't giving any issues then great but don't knock back owners opinions who are having problems or hijack a post from someone who's seeking help.

 

[The Big Bamboo]

Only stating what a lot of other owners are also experiencing, yes the B47 engine is supposed to return better figures than the last engine which is why I changed mine but in my case and for a lot of others it simply doesn't, my last 520 was a manual and was about 10 mpg better. This new improved car sounds absolutely crap when it regens and the fuel economy figures stated are just plain nonsense. Not sure why you would doubt what other owners are posting, if yours isn't giving any issues then great but don't knock back owners opinions who are having problems or hijack a post from someone who's seeking help.

...at what point was I hijacking a post?....and I'm not doubting anything that you or others are posting,...what gave you that impression?,....I was actually agreeing with you regards to the B47 MPG/regen issues.

Merely stating that the B47 is 2 steps forward in some respects (which it certainly is) but certainly a step backwards with regard to poor fuel economy and the regen/exhaust issues which apparently go hand-in-hand to some extent.

No offence intended. Sorry if it came across that way.

 

[e61paul]

maybe the admin should close this issue string as its becoming political??

 

[edber]

maybe the admin should close this issue string as its becoming political??

Its ok,no need to shut it down.

 

[318Pit]

First trip back with new car 80 miles on motorway and a roads - sticking to the limits and playing with all three settings saw an MPG of 52.8. Will update when I have more miles done but first impressions excellent and dropping from Comfort to Economy seemed to add around 5% but I need to do some more scientific testing.