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F10 / F11 (2011 - Current)
The new chapter in the highly successful story of the BMW 5 Series Sedan (F10) and wagon (F11)

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  #1  
Old 12-08-2013, 10:13 PM
dbs600 dbs600 is offline
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Very Poor Fuel Economy in Recent Months

Iíve been getting very poor fuel economy for the past three months.

Iíd previously get an average of 10 mpgís, but same dropped to 8.

Service engine light came on about a month ago and the dealer replaced an oxygen sensor.

I also complained of poor fuel economy, but the repair order came back stating no problem found and that there are additional fuel additives during winter months!? Strange, as I've never had this problem before.

Still getting 8 mpgís and exceptionally pissed with BMW's constant denial of problems when I have any; doesnít matter which dealer I use.

What should I do? Below 10 mpgís is just not right, and upsetting.

Thanks.
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  #2  
Old 12-08-2013, 11:29 PM
Motorboat411 Motorboat411 is offline
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which car are you talking about...528, 535, 550, 535d?
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  #3  
Old 12-08-2013, 11:51 PM
dbs600 dbs600 is offline
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Quote:
Originally Posted by Motorboat411 View Post
which car are you talking about...528, 535, 550, 535d?
I have an F02 750Li xDrive, comparable to an F10 550i xDrive.

Last edited by dbs600; 12-08-2013 at 11:52 PM.
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  #4  
Old 12-09-2013, 08:29 AM
saflang saflang is offline
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Winter fuel is blended differently, more light vapour gases such as butane for easier ignition but as a result the winter fuel mix is less energy efficient.

Summer-grade fuel has a different Reid Vapor Pressure (RVP) than winter-grade fuel, which contributes to its being (marginally) more eco-friendly. RVP is the vapor pressure of gasoline measured at 100 degrees Fahrenheit. Fuels with higher RVP evaporate more easily than those with lower RVP. A particular fuel blend's RVP is based on the combined RVP of the ingredients that make up the blend. Regulators worry about this evaporation because it contributes to ozone formation.

Gasoline must have an RVP below 14.7 PSI (pounds per square inch), which is normal atmospheric pressure; if a fuel's RVP were greater than 14.7 PSI, excess pressure would build up in the gas tank, and the fuel could boil and evaporate. Depending on the part of the country, the EPA's standards mandate an RVP below 9.0 PSI or 7.8 PSI for summer-grade fuel. Some local regulations call for stricter standards. Because of these varying RVP standards, up to 20 different types of boutique fuel blends are sold throughout the U.S. during the summer [Source: Slate].

Because RVP standards are higher during the winter, winter-grade fuel uses more butane, with its high RVP of 52 PSI, as an additive. Butane is inexpensive and plentiful, contributing to lower prices. Summer-grade fuel might still use butane, but in lower quantities -- around 2 percent of a blend [Source: The Oil Drum].
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  #5  
Old 12-09-2013, 09:52 AM
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I thought my Range Rover Sport had bad gas mileage at ~15 Mpg. Really glad I went with a 535i.
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  #6  
Old 12-09-2013, 10:08 AM
saflang saflang is offline
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F10 M5, Hwy average (600 mile trip @64MPH) = 23.3 MPG.
Average City (lots of stop and go and spirited runs) = 16.8 MPG
I think this is amazing fuel economy for 560HP !!!
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  #7  
Old 12-09-2013, 10:19 AM
wrickem wrickem is offline
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Are you calculating your mileage yourself or going by your car's calculations?
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  #8  
Old 12-09-2013, 10:31 AM
saflang saflang is offline
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Car's Calc's, but it seems pretty close for now.
My last fill up from an almost an empty tank 76L (20 gal) I drove 520Km (322miles) = 14.6L/100KM or 16.1 MPG
But I must say that any idling at all kills the fuel economy, I'd bet that my car uses as much gas idling as it does driving about 40MPH.
I know now why they have the Auto Start/Stop feature but I don't use it, too big of an engine to start/stop IMO.

Last edited by saflang; 12-09-2013 at 10:36 AM.
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  #9  
Old 12-09-2013, 02:34 PM
Gres718 Gres718 is offline
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Quote:
Originally Posted by saflang View Post
F10 M5, Hwy average (600 mile trip @64MPH) = 23.3 MPG.
Average City (lots of stop and go and spirited runs) = 16.8 MPG
I think this is amazing fuel economy for 560HP !!!
Do you use "ethanol free" gas?
I am getting similar highway numbers on my 550xi that is 100HP weaker .

IMHO: ethanol addition is one of biggest scams ever.
Why would you add 10% of crappy ethanol and loose 10-15% MPG?
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  #10  
Old 12-09-2013, 02:47 PM
Emilner Emilner is offline
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My 750 gets horrible mileage too. I was rear ended in an accident a week and a half ago. As such I have a Chevy suburban for a loaner- it is literally getting better gas mileage than my 7!!!!
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  #11  
Old 12-13-2013, 07:47 PM
dbs600 dbs600 is offline
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Quote:
Originally Posted by saflang View Post
Winter fuel is blended differently, more light vapour gases such as butane for easier ignition but as a result the winter fuel mix is less energy efficient.
Understood, but the car is going on its 3rd winter; haven't had this problem before.

Quote:
Originally Posted by wrickem View Post
Are you calculating your mileage yourself or going by your car's calculations?
My car's calculations, but as mentioned, this is a new problem, so even if my car's calculations are inaccurate, my mpg's have still gone down for what they are. Going to try computing on my own the over the next couple of fill ups; picture of my tachometer while idling below after fill up just now below...


Quote:
Originally Posted by Gres718 View Post
Do you use "ethanol free" gas?

IMHO: ethanol addition is one of biggest scams ever.
No, I don't. How do I go about sourcing ethanol free gas. Is it more money?

Quote:
Originally Posted by Emilner View Post
My 750 gets horrible mileage too.
What brand and grade gas do you use? I use Sunoco Ultra 93.
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Last edited by dbs600; 12-13-2013 at 07:49 PM.
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  #12  
Old 12-13-2013, 08:08 PM
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Needsdecaf Needsdecaf is offline
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Very Poor Fuel Economy in Recent Months

Quote:
Originally Posted by Gres718 View Post
Dr .

IMHO: ethanol addition is one of biggest scams ever.
Why would you add 10% of crappy ethanol and loose 10-15% MPG?
It's an oxygenate that helps emissions. Replaced MTBE which was highly toxic.




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  #13  
Old 12-13-2013, 10:34 PM
Gres718 Gres718 is offline
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Quote:
Originally Posted by Needsdecaf View Post
It's an oxygenate that helps emissions. Replaced MTBE which was highly toxic.




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Frankly, I don't care what they adding or how they modifying it or how they shuffle their deck. As soon as they did 10% ethanol adding my MPG droped 15% ( It was 2007 and at that time I was driving Acura TL)
For all I know -they adding highly "engine unfriendly" ethanol to my gas to save 10% of god knows what...
What is the point of deluting gas with ethanol if at the end I will use even MORE gas to get there?
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  #14  
Old 12-13-2013, 11:54 PM
dbs600 dbs600 is offline
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Quote:
Originally Posted by Gres718 View Post
What is the point of deluting gas with ethanol if at the end I will use even MORE gas to get there?
To make more money (and to support the ethanol industry).

Last edited by dbs600; 12-13-2013 at 11:55 PM.
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  #15  
Old 12-24-2013, 09:51 PM
dbs600 dbs600 is offline
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Thanks for the replies everyone.

Here's the second round of pictures.

So where does this put me?

Or do I need to go through another tank for an accurate number?

Thanks. :|
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  #16  
Old 12-25-2013, 07:52 AM
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raleedy raleedy is offline
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Quote:
Originally Posted by saflang View Post
Car's Calc's, but it seems pretty close for now.
My last fill up from an almost an empty tank 76L (20 gal) I drove 520Km (322miles) = 14.6L/100KM or 16.1 MPG
But I must say that any idling at all kills the fuel economy, I'd bet that my car uses as much gas idling as it does driving about 40MPH.
I know now why they have the Auto Start/Stop feature but I don't use it, too big of an engine to start/stop IMO.
Yes, you gotta leave that puppy running, I can't imagine what the BMW engineers were thinking when they equipped your car with ASS. Did they even think about the possibility that someone might actually USE it? Never mind what the manufacturer put into the car for fuel economy. Your opinion is all that matters.

Incidentally, to better understand whether there is something wrong with your car, you should track average speed along with mpg. There's a high correlation, in that low average speed results in high fuel consumption, all they way up (as your earlier comments imply) to infinite consumption at 0 mph.

Last edited by raleedy; 12-25-2013 at 07:56 AM.
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  #17  
Old 02-14-2014, 11:13 AM
dbs600 dbs600 is offline
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Dealer states they replaced all eight injectors and plugs.

Havenít picked up car yet, but letís see what result.

If improved, this isn't going to be a problem in another 3 years, is it!?

Thanks.
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  #18  
Old 02-14-2014, 11:25 AM
dbs600 dbs600 is offline
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Also, I understand the injectors have been through a number of revisions / redesigns.

Should I look out for any particular part numbers on the Repair Order?
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  #19  
Old 02-14-2014, 03:45 PM
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skalberti skalberti is offline
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How many miles on the Op's car? An O2 sensor can cause bad mpg and not show a check engine light. Ethanol is less efficient than regular gas, and also destructive to our cars.


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  #20  
Old 02-14-2014, 05:17 PM
Fastpaddler Fastpaddler is offline
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Quote:
Originally Posted by Gres718 View Post
Frankly, I don't care what they adding or how they modifying it or how they shuffle their deck. As soon as they did 10% ethanol adding my MPG droped 15% ( It was 2007 and at that time I was driving Acura TL)
For all I know -they adding highly "engine unfriendly" ethanol to my gas to save 10% of god knows what...
What is the point of deluting gas with ethanol if at the end I will use even MORE gas to get there?
Yes.I agree. Ethanol added fuels seem to return poorer mpg. I find my 528i gets I estimate(doing km/mile conversion), about 8 to 10 mpg LESS.
I have switched to non-ethanol even though I liked the company brand for keeping my injectors clean. HMM...
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  #21  
Old 02-14-2014, 05:20 PM
Fastpaddler Fastpaddler is offline
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Quote:
Originally Posted by dbs600 View Post
Dealer states they replaced all eight injectors and plugs.

Havenít picked up car yet, but letís see what result.

If improved, this isn't going to be a problem in another 3 years, is it!?

Thanks.
They replaced all the injectors in a 2011!!!?? I agree that could be the problem but if you were not getting misfires or unstable rpms, I am suspicious. Clean injectors DO help fuel economy. How many miles on your car?
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  #22  
Old 02-14-2014, 07:10 PM
dbs600 dbs600 is offline
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Quote:
Originally Posted by skalberti View Post
How many miles on the Op's car? An O2 sensor can cause bad mpg and not show a check engine light. Ethanol is less efficient than regular gas, and also destructive to our cars.
Quote:
Originally Posted by Fastpaddler View Post
They replaced all the injectors in a 2011!!!?? I agree that could be the problem but if you were not getting misfires or unstable rpms, I am suspicious. Clean injectors DO help fuel economy. How many miles on your car?
2011 750Li xDrive with just under 30k miles.

O2 sensor tripped the check engine light previously, which was replaced on the last service visit.

Hope my mpg's have gone up... :|

Last edited by dbs600; 02-14-2014 at 07:11 PM.
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  #23  
Old 02-15-2014, 02:40 PM
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skalberti skalberti is offline
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Quote:
Originally Posted by dbs600 View Post
2011 750Li xDrive with just under 30k miles.

O2 sensor tripped the check engine light previously, which was replaced on the last service visit.

Hope my mpg's have gone up... :|
Was it the O2 sensor up front closest to the engine? If so that's the one that'll help you on the MPG's
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  #24  
Old 02-15-2014, 06:59 PM
dbs600 dbs600 is offline
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Disappointed, upset, confused and sad.

All eight injectors and plugs were replaced, but there's now some type of roughness / un-smoothness!?

Happened once when idling and felt at times after keeping on the gas, but letting up a little after gear change.

Haven't noticed a difference in mpg's either, but today wasn't a good indication for same due to the snow.

Also no 'boost' in power / acceleration from what others have reported with new injectors and plugs.

Last edited by dbs600; 02-15-2014 at 07:05 PM.
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  #25  
Old 03-01-2014, 10:28 AM
dbs600 dbs600 is offline
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Quote:
Originally Posted by dbs600 View Post
Disappointed, upset, confused and sad.

All eight injectors and plugs were replaced, but there's now some type of roughness / un-smoothness!?

Happened once when idling and felt at times after keeping on the gas, but letting up a little after gear change.

Haven't noticed a difference in mpg's either, but today wasn't a good indication for same due to the snow.

Also no 'boost' in power / acceleration from what others have reported with new injectors and plugs.
Getting to be pretty ridiculous! The latest:
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