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      10-15-2020, 09:36 PM   #1
xoniv
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N52 High Fuel Consumption?

Hello, I’ve recently purchased a 2008 325i. It has around 133k kms, the engine runs overall smoothly but it does have a very rough cold start that feels like the car is just jerking back and forth.
I’ve had it for a month now and had to refuel 4 times (driven it for around 1400km total). Each refuel has been 55 liters.
I only drive in the city and I am getting between 15.5 and 16 l/100km (15 mpg).
I don’t drive aggressively either, I rarely go above 4k rpm.
Is this consumption normal for these engines? What gas mileage are you guys getting on your N52?
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      10-15-2020, 10:08 PM   #2
E92William
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I get 17-20 mpg but I shift at 3k almost every time. You should scan it and see if there are any codes
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      10-15-2020, 10:29 PM   #3
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I get 14 city, 23 @ 85 MPH on my 06' N52 6MT... seems on the low side as well.
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      10-15-2020, 11:01 PM   #4
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I get descent gas mileage, could be better but I can't help myself. Between shifting at 3k, cruising at 2-2.5k and constantly blipping the throttle for pops.. I'll edit this with my average mpg from the last couple weeks
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      10-16-2020, 06:29 AM   #5
xoniv
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Quote:
Originally Posted by E92William View Post
I get 17-20 mpg but I shift at 3k almost every time. You should scan it and see if there are any codes
It seems like there aren’t any fault codes. This is very strange, I would never expect a 2.5 liter engine to consume this much fuel. My friend drives an M2 and we get the same gas mileage lol
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      10-16-2020, 07:26 AM   #6
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Overall 11.0L/100km
short drives with cold engine (to work each morning )- 13.0
long (2hr drives to the cottage or major city nearby) - 8.2
driving around town all day with a warm engine (weekends) - 9.5

Its all about engine Temp for me
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      10-16-2020, 08:28 AM   #7
eljay
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Quote:
Originally Posted by dylane_92 View Post
Overall 11.0L/100km
short drives with cold engine (to work each morning )- 13.0
long (2hr drives to the cottage or major city nearby) - 8.2
driving around town all day with a warm engine (weekends) - 9.5

Its all about engine Temp for me
I get similar numbers. Around 11.5L in short city commutes and around 9L outside the city.

Now, before you start looking for N52 problems, check your brakes!
Seriously. I keep track of my consumption and on one of my previous cars, it jumped quickly and I couldn't explain it. When I poked around a car, I once noticed a faint smell of rear brakes. Rear caliper was sticking intermittently, so the car drove OK, but obviously had to work harder. Just a tip.
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      10-16-2020, 09:36 AM   #8
freakystyly
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Good tip... After a drive, touch the face of the wheel near the hub, if one is hotter than the others it is a good sign of a seized caliper or bad bearing.

I'm around 10L/100km without taking it easy. 16L is pickup truck territory.
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      10-16-2020, 12:16 PM   #9
hassmaschine
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my long term average is 23-24. The 330i 6mt kills it on the highway though with the 3.15 final drive - that's easily 30+.

15mpg sounds really bad though. That's close to what our gas hog X5 gets!
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      10-16-2020, 12:20 PM   #10
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06 330xi w/ 170k. I stay at 25.0-25.5 mpg, per the dash.

My daily to work, which is a 83mile commute round trip. I do not let it warm up. Start and go while taking it easy.
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      10-16-2020, 12:41 PM   #11
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Yeah that’s way high.

My average is 10.8 l/100km.
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      10-16-2020, 01:30 PM   #12
xoniv
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Here is my current consumption for regular city driving:
View post on imgur.com
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      10-16-2020, 01:32 PM   #13
xoniv
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Quote:
Originally Posted by freakystyly View Post
Good tip... After a drive, touch the face of the wheel near the hub, if one is hotter than the others it is a good sign of a seized caliper or bad bearing.

I'm around 10L/100km without taking it easy. 16L is pickup truck territory.
I will definitely check that after my next drive and keep you updated.
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      10-16-2020, 02:01 PM   #14
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City driving I saw 14mpg in the wagon. Sounds about right
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      10-16-2020, 02:37 PM   #15
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I saw a big jump in fuel consumption a few months ago. Checked my air filter and found that it was almost completely blocked. I have a k&n filter so just washed and reoiled it. Consumption now back to normal of about 7.8l/100km. Might be worth checking your filter and spark plugs as well.
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      10-16-2020, 02:49 PM   #16
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Quote:
Originally Posted by EvaBmw View Post
I saw a big jump in fuel consumption a few months ago. Checked my air filter and found that it was almost completely blocked. I have a k&n filter so just washed and reoiled it. Consumption now back to normal of about 7.8l/100km. Might be worth checking your filter and spark plugs as well.
I missed the part in the op about shudder. Yes, sounds like a normal maintenance "tune-up" is in order: oil, filters, spark plugs.
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      03-26-2023, 11:57 AM   #17
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Hey, I also has the cold start shudder. Have you found any fix for it?
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      07-29-2023, 12:31 AM   #18
aexichim
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In my N52 e90 2.5xi i have in the city 22.8, i am sad that i cannot add a photo straight here, but on highway i managed to get a 10.6

Proof:
View post on imgur.com
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      07-29-2023, 01:14 PM   #19
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All US e90's use a 3 liter engine.

All US e90's use a 3 liter engine.
And don't use direct injection.
Even the 06 labeled as a 325
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      07-30-2023, 07:00 AM   #20
Andrein52b52a
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@aexichim
So you have the 218hp version right?
I have the same car e90 325xi automatic and I get around 14-15 l in the city and like 9-10 on the highway at 120km per hour.
Do you have any codes or did you read your fuel trims?
I am curious if this is normal for our cars since they are a bit heavier than normal e90
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      07-30-2023, 07:47 AM   #21
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11.4l/100 km city
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