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E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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  #1  
Old 07-10-2005, 01:59 AM
jason_jm jason_jm is offline
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Bad fuel consumption

OK, here goes

When I drive my 330i sports package on long distance it does well, open road on the way to say san diego, cruise control at 75 MPH, I get 32MPG, Cruise control at 85/90 gets 30 MPG


Driving CAREFULLY around town, in Los Angeles typical stop start traffic, I cannot get over 16 MPG ever

Driving the car hard around town, late at night with no traffic..... 10 MPG

so in summary im pretty dissapointed in the MPG except for the open road

this is going to be an expensive car to run

so far 880 miles on the clock, and 4 used tanks to get there - averaging around 15/16 MPG
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  #2  
Old 07-10-2005, 02:23 AM
jason_jm jason_jm is offline
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oh yeah and another thing that sucks, the last bit of braking!

this car is VERY hard to stop at a complete standstill without a jerky type stop

really have to concentrate to ease off the brake pedal carefully

the brakes just cling too hard and have sort of a dead zone feel when braking to a complete stop (and I am talking a normal stop here, not hard driving)
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  #3  
Old 07-10-2005, 03:03 AM
Schneur Schneur is offline
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I get 10mpg driving around the streets of brooklyn in a 325i

& I agree its almost impossible to do a soft brake stop, it really sucks
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  #4  
Old 07-10-2005, 03:07 AM
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Agree on the hard braking. There's just no getting away from the last bit of brake "jerk" no matter how gentle you are in easing the brakes.

Regards to mpg. I have been monitoring my mileage for the past 1300 miles. on straight gun-it freeways, sucky stop-n-go city traffic, twisty scenic routes.. and my mileage is 25mpg..
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  #5  
Old 07-10-2005, 03:28 AM
bim530mer bim530mer is offline
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..

same thing on 530 here.. you need a massager foot wearing no Cat
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  #6  
Old 07-10-2005, 03:54 AM
jason_jm jason_jm is offline
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Quote:
Originally Posted by Schneur
I get 10mpg driving around the streets of brooklyn in a 325i

& I agree its almost impossible to do a soft brake stop, it really sucks

10 MPG?

there is something wrong with the design of this 3L engine

my corvette with a 6 liter V8 gets better MPG than these e90s
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  #7  
Old 07-10-2005, 04:01 AM
Broken1 Broken1 is offline
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You people really need to let your engines run in properly before you start complaining or monitoring fuel consumption. When you car has 2000 or 3000 mi then you can start thinking of the fuel consumption
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  #8  
Old 07-10-2005, 04:16 AM
jason_jm jason_jm is offline
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Quote:
Originally Posted by Broken1
You people really need to let your engines run in properly before you start complaining or monitoring fuel consumption. When you car has 2000 or 3000 mi then you can start thinking of the fuel consumption

ok, ill give it another 2000 miles and then post back on this thread

maybe by then the power will be up too (hopefully)
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  #9  
Old 07-10-2005, 07:16 AM
RachelS RachelS is offline
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I have 3500 now and just went on a little trip.

This is what we got. 34 MPG in a 60 mile stretch. HWY at 70 MPH

27 MPG within the city, stop lights and all.

What we did to test this was to reset the MPG at every drive type eg. HWY & CITY.

Warning, I do not know if this is a bug, but if you reset it while idling for a few minutes, say more than 3, the number will be off. I think it's a bug.

Here is the best way to check:

Go to a gas station and remember the pump you are using. Put the nozzle in and let the pump stop by itself. Do not over fill. Pull it out when it stops.

Rest trip odometer. Drive for about 30-50 miles.

Go back to the EXACT SAME PUMP THAT DAY you used, Re-fill and let it run till it stops by itself. Do not overfill.

Divide the miles driven by gallons used on the second fill up,
E.g. 30 miles divided by 1.2 gallons on second fill up = 25MPG

Last edited by RachelS; 07-10-2005 at 07:19 AM.
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  #10  
Old 07-10-2005, 07:24 AM
ObD ObD is offline
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Y'all have way too much time on your hands. If you are worried about MPG, drive an Echo.
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  #11  
Old 07-10-2005, 08:24 AM
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Quote:
Originally Posted by ObD
Y'all have way too much time on your hands. If you are worried about MPG, drive an Echo.
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  #12  
Old 07-10-2005, 09:06 AM
silverado silverado is offline
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The car has a soft-stop feature that engages sometimes. As far as I can tell, it happens when you press the breaks early and in an constant fashion and the car thinks it can anticipate the stopping distance well. In that case, the breaks are automatically eased off (without you changing the pressure on the pedal). For all other cases, the car exhibits what's (at least in my mind) the signature final grip of the 3 series. I owned an E30 years ago and now an E90, and they both do the final hard grip of the breaks. You can ease off the breaks yourself and make it stop softly -- I do it now all the time. Like anything else, it takes some practice, but I can now do it without thinking and I've driven 2500 miles on it.

Best of luck
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  #13  
Old 07-10-2005, 11:16 AM
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MarcusSDCA MarcusSDCA is offline
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On a side note, since I'm going back to a 6sp manual I was wondering if there is any real downside to coasting in "neutral" to save on fuel. I live in a part of San Diego that has some very long gentle sloping roads and I can imagine just coasting down them out of gear. Other than the lack of engine braking are there any reasons this isn't a good idea?
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  #14  
Old 07-10-2005, 12:57 PM
jcl10 jcl10 is offline
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Quote:
Originally Posted by MARCUS330i
I was wondering if there is any real downside to coasting in "neutral" to save on fuel. I live in a part of San Diego that has some very long gentle sloping roads and I can imagine just coasting down them out of gear. Other than the lack of engine braking are there any reasons this isn't a good idea?
Yes. It is unsafe. It is also illegal in most jurisdictions (not sure about yours).

Keep your foot off the throttle going downhill. There is no measurable fuel going through the engine. You aren't saving anything.
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  #15  
Old 07-10-2005, 01:42 PM
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dynosor dynosor is offline
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No - overrun fuel cut-off makes coasting in neatral more wasteful

Modern fuel injected engines cut their fuel off completely when you lift you foot off the throttle until the revs drop to 1200 - 1500 RPM. If the car is in gear at speed the revs drop slowly. If you depress the clutch, the revs drop quickly. In either event, the ECU won't let the engine stall. Coasting in neutral requires fuel to keep the engine running, and will use more fuel than coasting in gear. The latter uses the momentum of the body to keep the engine running.

Search Google for overrun fuel cut-off and see for yourself:

http://www.google.com/search?biw=12...un+fuel+cut-off


Quote:
Originally Posted by MARCUS330i
On a side note, since I'm going back to a 6sp manual I was wondering if there is any real downside to coasting in "neutral" to save on fuel. I live in a part of San Diego that has some very long gentle sloping roads and I can imagine just coasting down them out of gear. Other than the lack of engine braking are there any reasons this isn't a good idea?

Last edited by dynosor; 07-10-2005 at 03:39 PM.
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  #16  
Old 07-10-2005, 03:09 PM
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willpooted willpooted is offline
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I'm averaging 24 mpg after 5200+ miles.
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  #17  
Old 07-10-2005, 03:14 PM
jason_jm jason_jm is offline
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well it seems that the only other person complaining about gas mileage lives in a very heavy traffic area like I do

perhaps its the stop start all the time that the engine really doesnt like
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  #18  
Old 07-10-2005, 03:45 PM
Alex Baumann Alex Baumann is offline
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Every car burns more gas in the city (start/stop) than on the highway.
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  #19  
Old 07-11-2005, 12:00 AM
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Patrick330i Patrick330i is offline
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Quote:
Originally Posted by MARCUS330i
On a side note, since I'm going back to a 6sp manual I was wondering if there is any real downside to coasting in "neutral" to save on fuel. I live in a part of San Diego that has some very long gentle sloping roads and I can imagine just coasting down them out of gear. Other than the lack of engine braking are there any reasons this isn't a good idea?
805 fwy heading north over the 8 fwy? Just curious.

I agree with others who say GIVE IT SOME TIME to essentially brake in. I am at 23,000 miles and my mpgs are pretty predictable at this point. Anywhere from 22-24 in mixed driving.
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  #20  
Old 07-11-2005, 04:51 AM
gesoffen gesoffen is offline
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Quote:
Originally Posted by dynosor
Modern fuel injected engines cut their fuel off completely when you lift you foot off the throttle until the revs drop to 1200 - 1500 RPM. If the car is in gear at speed the revs drop slowly. If you depress the clutch, the revs drop quickly. In either event, the ECU won't let the engine stall. Coasting in neutral requires fuel to keep the engine running, and will use more fuel than coasting in gear. The latter uses the momentum of the body to keep the engine running.
None of this takes into account the reduced coasting distances of idling in gear (manual trans.) due to compression braking.
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  #21  
Old 07-11-2005, 10:09 AM
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MarcusSDCA MarcusSDCA is offline
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Quote:
Originally Posted by Patrick330i
805 fwy heading north over the 8 fwy? Just curious.

I agree with others who say GIVE IT SOME TIME to essentially brake in. I am at 23,000 miles and my mpgs are pretty predictable at this point. Anywhere from 22-24 in mixed driving.
No....but that is one LONG downgrade. I'm in Point Loma.
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  #22  
Old 07-11-2005, 10:42 AM
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schley schley is offline
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Quote:
Originally Posted by Alex Baumann
Every car burns more gas in the city (start/stop) than on the highway.

Except some hybrid technology which will capture braking electricity to charge your batteries which will be used until hitting 20-25 mph. So congested traffic, no unlike what we find in LA, Chicago, you could burn less gas. Not trying to be anything but informative and I hope we get to a day where we don't use gas in our engines but other means of power for our rides. )

I'm sure that will get some responses! ha

Last edited by schley; 07-11-2005 at 10:45 AM.
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  #23  
Old 07-11-2005, 01:24 PM
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Mr. E Mr. E is offline
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10 MPG is just crazy, if it continues like that you should learn to treat the gas pedal as something other than an on/off switch.

For comparison, my E46 M3 gets around 27 MPG highway (best case) and averages about 16-17 MPG around town. I don't baby it, either!
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  #24  
Old 07-11-2005, 04:15 PM
john4.4x5 john4.4x5 is offline
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Quote:
Originally Posted by silverado
For all other cases, the car exhibits what's (at least in my mind) the signature final grip of the 3 series. I owned an E30 years ago and now an E90, and they both do the final hard grip of the breaks. You can ease off the breaks yourself and make it stop softly -- I do it now all the time.
I LOVE my 3 series brakes. I know exactly what you are refering to. That signature final grip was apparent in my E46 and now my E90. I love it!
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  #25  
Old 07-11-2005, 04:49 PM
CC 330i CC 330i is offline
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I am averaging 24 MPG (mostly open road highway driving at 80+ MPH and no traffic). While this is not great, I drive pretty hard around town. Also I have noticed that the mileage is getting better all the time as the engine breaks in. I have about 2,300 miles on my car now. For reference, I am getting almost 400 miles out of every tank. If I went below 1/8 tank, I could get 400 miles out of every tank. The most gas I have put in was 14 gallons. 400 miles on 14 gallons works out to 28.5 MPG.

I am from San Diego originally, and drive down there a lot to see my parents and my wife's parents. Just to remind you, driving from LA to SD you will inevitably be in traffic a great deal of the time. This is more like "in town" driving than freeway driving unless you do the drive at 3 AM. If you have to hit the brakes more than one time in 5 minutes, this is not true "freeway" driving, and gas mileage will seriously suffer when you have to then accelerate to get back up to speed. If you floor it to do so, mileage will go way down.

I have also not had one problem with the brakes at all. I didn't even know there was a "soft stop" feature until I read about it on this forum. I always release a little pressure on the brakes as I come to a stop to make a smooth stop, and I didn't change my technique with this car a bit and I have never had a jerky stop. I recently tried keeping constant pressure on the brakes coming to a stop and soft-stop worked. No jerky stop. Try releasing a little pressure just as the car comes to a rest, or just keeping constant pressure (moderate). I think you might be INCREASING pressure when the car is coming to a stop.

I think it's interesting that you lament the lack of power, and then say that drive conservatively around town. How would you know the power is not to your liking unless you are flooring it? I'll bet you are on the gas pretty hard around town most of the time if you are getting that bad of mileage.

I'll also bet that your car is an Automatic, isn't it? Just a hunch, and it's not based on your fuel consumption figures.

But if your fuel consumption is really that bad, I would suggest taking it in to have the dealer look at it. You might have a bad O2 sensor, or perhaps something wrong with the intake.
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