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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N57 / M57 Turbo Diesel Discussions - 335d > E90 335d with poor gas mileage.



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      08-14-2012, 02:15 PM   #1
roycel
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E90 335d with poor gas mileage.

My girlfriend and I purchased a 2009 335d roughly 1 year ago, and we put on it 25k miles. We unfortunately just passed the 50k mile mark. I would otherwise bring it into the dealer...

Right before we hit 50k miles (around 48k), we got a CEL, and brought the car in 3 times over a month. The first time, the dealer changed the MAF. The 2nd time, I think they cleaned some stuff. The last time, the head mechanic took the car home, drove it around for maybe 100 miles over a week, then took the head off. He did a bunch of things... It was lengthy list.

Anyhow. 4k miles or so later, for the last 2 gas tanks, we've averaged 23-25mpg with 50% city/ 50% highway driving. I've calculated those numbers at the gas pump... The average is also low on the trip computer. Our calculated range now reads in the 430-ish mile range with a full tank.

I actually keep a pretty good log at fuelly.com, and this is really low. in the past, we've averaged between 31 and 32mpg.

Does anyone have any suggestions? I'm a bit of DIY'er, and I think I'll try a few things before I bring it in to an Indy. ...I've got an 24, an e28, and an e36 M3 that I toy around with.

Any suggestions?


One more thing... I am in Phoenix, and the temperatures have been between 110 and 120 everyday. So when I'm in the car, the A/C is on max. Will a car run less efficiently (disregarding a/c usage) in hotter temps?

Thanks in advance.

Last edited by roycel; 08-14-2012 at 02:29 PM.
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      08-14-2012, 02:53 PM   #2
GreekboyD
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Doing the math for myself here in Canada, 430 miles is about 700 km a tank. I'd say it's pretty good considering you always have the AC on max because that will decrease your mileage for sure.

Have you always had the AC at max level in the past too?
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      08-14-2012, 06:22 PM   #3
kbsilver
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You may be seeing the same issue many other d owners are recently experiencing. During one of your times being repaired they probably applied the EGR recall/update (Campaign # 11E-A03). This includes, among other things, replacing the EGR valve with a newer design and updating the DME program (mapping) that runs the engine. Immediately following the DME update, many of us have experienced an approximate 10% drop in fuel economy. I know some of the loss is due to hot weather and more AC (figure at most 2 MPG highway).

I have been following & contributing to several threads on this subject. The information seems to suggest that if you have a late build 2011, it already had the updated DME program and these cars never achieved as good MPG as the older d's, Once an older d was updated, it has similar (lower) MPG as a later model. Mine is an early 2011 (built in 2010).

I am a conservative driver (most the time). Before the update I was easily able to break 40 MPG on the highway and did 42 highway with no AC for a trip of over 1/2 tank. Now resetting the MPG WHILE driving, and with no stopping, flat roads and constant (near legal) speeds, best I can do is 37 for a period of anything over 10 minutes.

The CEL you had was due to a EGR and intake system plugged with soot (pulling the head to fix is a very strong clue). We have to assume the update changes the fueling profile to create less soot to avoid the exact issue you and some other higher mileage d owners had. Not sure if reducing the MPG was deliberate, incidential or if BMW even knows about it (they should by now). But logically you would think lower MPG would create more soot.

Not that we have much choice, I would be willing to accept the lower MPG as long as it was acknowledged by BMW and explained to me the the technical reason why they lowered my cars efficency, something I paid a premium for when I purchased it.

On the other hand some people see no difference after the update, but these people also never achieved the top MPG that others have.

Last edited by kbsilver; 08-15-2012 at 10:11 AM.
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      08-15-2012, 12:42 PM   #4
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Car is rated for 23 city / 36 highway. I've never hit 40 on hwy but I drive north of 75 mph. I currently avg 30 with 20-30% city mixed in. I have a 2010.

We paid for 36 not 40.

Last edited by Socom; 08-15-2012 at 12:46 PM. Reason: z
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      08-15-2012, 02:49 PM   #5
kbsilver
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Quote:
Originally Posted by Socom View Post
Car is rated for 23 city / 36 highway. I've never hit 40 on hwy but I drive north of 75 mph. I currently avg 30 with 20-30% city mixed in. I have a 2010.

We paid for 36 not 40.
I said I drive conservatively, I always exceed the MPG ratings on every car. The car has proven it can deliver better mileage, there needs to be a good reason to take it away.

With only 30 MPG average sounds like you are below the rating as well. While it doesn't seem to be an issue for you, it is for me.

Last edited by kbsilver; 08-15-2012 at 02:57 PM.
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      08-15-2012, 02:57 PM   #6
roycel
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Thanks for the feedback fellas. Especially the EGR related comment, kbsilver... I was not aware of that recall, so I'm going to review my receipts and more closely look for clues.

I'll continue to monitor my fuel efficiency during the next several fill-ups and will post. It's not like I didn't already do that anyway. heh.

I have a good 25k miles worth of samples over the past year, and my recent fuel efficiency is worse than before. The drop off was sudden. Hence my post.

And about the highway rating of 36. ...I used to average above that (but not 40mpg) when I use cruise control at a speed of 75mph. I drive to Las Vegas and Los Angeles pretty often (350+ drives), and I definitely have developed mpg expectations.

30mpg kind of sucks. If this was the number advertised, I probably would've pushed for a 328i and a nice chunk of change.

btw, my M3 averages around 26 when I drive 80% highway...

http://i1111.photobucket.com/albums/...l/receipt1.jpg

Last edited by roycel; 08-15-2012 at 03:22 PM.
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      08-15-2012, 04:24 PM   #7
igom3
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Quote:
Originally Posted by kbsilver View Post
I said I drive conservatively, I always exceed the MPG ratings on every car. The car has proven it can deliver better mileage, there needs to be a good reason to take it away.

With only 30 MPG average sounds like you are below the rating as well. While it doesn't seem to be an issue for you, it is for me.
I think he is right on the target. I can get 40mpg on the hwy going 65-67mph and no AC. This car is deigned for long trips to make that mileage. I can tell you that in the city driving and constant stop and go i can't get more than 22-23mpg which was mileage listed on the sticker. BTW short trips kill your millage too. JMO
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      08-15-2012, 11:46 PM   #8
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my car is experiencing the same thing. MPG before the recall was 33.4 and and after the recall is 32.2.
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      08-16-2012, 06:59 AM   #9
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Quote:
Originally Posted by kbsilver View Post
I said I drive conservatively, I always exceed the MPG ratings on every car. The car has proven it can deliver better mileage, there needs to be a good reason to take it away.

With only 30 MPG average sounds like you are below the rating as well. While it doesn't seem to be an issue for you, it is for me.
You can always get better mileage. DPF/EGR delete will work wonders for example. My point is that I see no reason why you're entitled to an explanation at to why your vehicle no longer performs above what was advertised but does perform as advertised. Makes no sense.
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      08-16-2012, 09:07 AM   #10
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I've gotten a large drop in MPG's I used to average 32-34mpg and now I'm at 28-29mpg. That's doing the same driving on the same commute.
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      08-16-2012, 11:15 PM   #11
roycel
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Concentric190... Weird. I've had the same cars in your picture signature, except my Audi C5 A6 Avant was a standard version instead of the Offroad. It now belongs to my brother.

I now have a 335d, e36 M sedan, 635csi, and a stroked e28 535i.
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