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      06-07-2016, 12:30 PM   #1
E9Slow
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What kind of MPGs does your n52 get?

Hey guys, so I'm just wondering as the title says, what kind of MPGs do you guys get with your n52s? Mine is a '07 e90XI n52 with almost 85k, and it's mostly 80% around town and 20% commuting for it now, and I only fetch around 15-17mpg, based only on the cars calculations (haven't done it by hand yet to see if there is a variance). Granted I have awd, a muffler delete (which I'm trying to drive less aggressively to get a more accurate reading, although it's not easy) and have a drop-in k&n w/charcoal delete intake, but I don't know what significance those factors play, if any, in gains or losses. When my girlfriend owned the car before me, her commuting was 90% highway, 10% around town, if not more highway, and the car read pretty consistently 22.4mpg. Do these figures sound about right/average, or is there anything I can replace/upgrade while now at 85k that could improve these figures?

And please don't get me wrong, I'm not looking for Prius MPGs, and Fuel efficiency is definitely not a reason why we bought this car, and after my last truck, filling up once a week for $35 still makes me grin every time; I'm just trying to assess if this is properly performing MPGs or if maybe something is due for replacement that may positively impact fuel efficiency. Thanks in advance!
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      06-07-2016, 01:40 PM   #2
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You're an automatic with AWD, so it's going to be a crapshoot no matter what.

Make sure there is no oil on the valvetronic sensor, make sure you're ALWAYS using premium (lower grades will actually give you less power and fuel economy) and keep your foot out of it.

I can get mid 30s on the highway (32-35mpg) steady depending on speed, and high 20s around town...but I am a manual RWD.
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      06-07-2016, 01:42 PM   #3
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2012 E91 RWD AT. My average is 21.5 combined, but that's dealing with all the LA stop and go traffic. On the open highway I get between 25-30.
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      06-07-2016, 01:54 PM   #4
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I do envy you RWD manual guys (I didn't "shop" for this car, I ended up trading in my truck since the GF wanted a new CTS and I just took over the BMW for her) although ideally soon (-er or later) I'm going to be hunting for a 335i wagon.

Regardless, I know the AT and XI kills me, especially considering my mainly around town commute. However, even on longer highway trips, I don't usually see much better than 22-24mpg, although I wonder if that may have to do with speed (usually 80-85mph on cruise).

Just seems like 15-17 even around town is a little low for just an NA 3.0 in a car so light (even though XI is heavier than non).

Edit:

I do need to check the valvetronic sensor, which is coming up soon with the VCG/OFHG job, that being the sensor in the middle of the valve cover, facing the passenger fender correct? I've also heard I need to be checking the eccentric sensor closer near to the front of the VC for oil in plug also, unless I'm confusing these two. FWIW, the gasket around the valvetronic (center of VC) is leaking oil, and subsequently getting replaced at same time as VCG.

As far as fuel, I always use Shell/Mobil, etc and only 93 octane (manual says 91+, so I hope/assumed 93 should be ok/superior). Also always only run Mobil1 euro 0w40 (although planning to change to luqimoly on next change based on reviews).
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      06-07-2016, 02:11 PM   #5
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i kid you not, these are my figures. On a longer trips it's more economical to go faster.

hwy on (depends on wind and terrain):
cruising at 85-90mph = 30-32mpg
cruising at 80mph = 32-35mpg
cruising at 75mph = 29-35mpg
cruising at 70mpg = 28-32mpg
cruising at 65mpg = 27-30mpg

City:
heavy stop and go = 17mpg
stop and go with heavy foot = 15mpg
normal city traffic = 20-24 mpg

average consumption in DC (DC traffic sucks, thus lower number):
23 - with about 75% of city driving (avg speed of 20 mph)

Removing charcoal filter, and installing headers yielded better fuel economy - i think i picked up about 1-3 mpg.
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      06-07-2016, 02:15 PM   #6
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Quote:
Originally Posted by W37V
i kid you not, these are my figures. On a longer trips it's more economical to go faster.

hwy on (depends on wind and terrain):
cruising at 85-90mph = 30-32mph
cruising at 80mph = 32-35mpg
cruising at 75mph = 29-35mpg
cruising at 70mpg = 28-32mpg
cruising at 65mpg = 27-30mpg

City:
heavy stop and go = 17mpg
stop and go with heavy foot = 15mpg
normal city traffic = 20-24 mpg

average consumption in DC (DC traffic sucks, thus lower number):
23 - with about 75% of city driving (avg speed of 20 mph)

Removing charcoal filter, and installing headers yielded better fuel economy - i think i picked up about 1-3 mpg.
Hmm, that's pretty interesting and I always wondered that based on the cruising RPMs at these speeds, if I reset the OBC while on highway, I was netting a best average at about 78mph too, so it seems like a little faster is a little more productive.

I guess the 15-17 around town is about on par then for me, especially considering I'm a little heavy-footed at times with the recent muffler delete, I just can't help it. Still, I can't complain about $35, empty to full for premium once a week. Last truck was about $80 for mid grade and that was occasionally twice a week, and the diesel truck... Ugh forget about it.
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      06-07-2016, 02:27 PM   #7
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RWD manual 176k on it...with the snow tires I get 29 MPG average. I reset it when I swap to summer tires and with the staggered 18's running Pilot sport zsp's I get 27.3.

Mostly highway and mostly high speeds, but I deal with Traffic about 2-3 times per week.
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      06-07-2016, 02:40 PM   #8
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Quote:
Originally Posted by E9Slow View Post
I'm going to be hunting for a 335i wagon
Not to burst your bubble, but all the E9x wagons in the states are 328's.

To answer your original question, I'm averaging 22.8 mpg right now, but my car sees quite a bit more highway time than city driving.
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      06-07-2016, 02:45 PM   #9
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Quote:
Originally Posted by fravel
Quote:
Originally Posted by E9Slow View Post
I'm going to be hunting for a 335i wagon
Not to burst your bubble, but all the E9x wagons in the states are 328's.
Bubble definitely burst.



Lol j/k thanks I didn't look into it yet hard enough to know that, just assumed it was a possibility like an since the e90/e92/e93 were all possibilities. That said, i guess I'll be hunting an e90 335i in the future lol.

Sounds like a large majority of you guys are highway commuters which makes me a bit of an outlier. Definitely wish I had more of a highway commute again to be able to open the car up more frequently (plus I know the constant short drives aren't healthy long term for a car like this).
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      06-07-2016, 03:18 PM   #10
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In my wagon, which is AWD/6AT, around town I get 17-18, highway I get about 26, but I can't seem to keep my speed below 80. My girlfriend drives slower and gets better highway MPGs in my car in the 27-28mpg range.



My 2006 E90 325i was rwd/6mt and I got much better mileage, in the 31-32mpg range on the highway and 20-21 around town.

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      06-07-2016, 03:26 PM   #11
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Quote:
Originally Posted by E9Slow View Post
Sounds like a large majority of you guys are highway commuters which makes me a bit of an outlier. Definitely wish I had more of a highway commute again to be able to open the car up more frequently (plus I know the constant short drives aren't healthy long term for a car like this).
You could always get a little beater car to drive on short commutes. I'm planning on my 330i being my "fun car" for another 10 years or so, so I've got a 5-speed civic I use for commuting.
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      06-07-2016, 04:22 PM   #12
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06 330i AT w/ 154k I get around 16mpg but all I drive is city. Last time I drove a decent distance on the highway I averaged in the low 30's when I calculated it.
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      06-07-2016, 05:18 PM   #13
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I get around 14-16mpg as well. 2006 330xi with 126k miles.

I do mainly city driving. Only travel on the highway every couple weeks or so.
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      06-07-2016, 05:33 PM   #14
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Quote:
Originally Posted by fravel
Quote:
Originally Posted by E9Slow View Post
Sounds like a large majority of you guys are highway commuters which makes me a bit of an outlier. Definitely wish I had more of a highway commute again to be able to open the car up more frequently (plus I know the constant short drives aren't healthy long term for a car like this).
You could always get a little beater car to drive on short commutes. I'm planning on my 330i being my "fun car" for another 10 years or so, so I've got a 5-speed civic I use for commuting.
I've thought about this but my commute is SO short (5 min drive) it's almost not worth it really. I have debated maybe just getting another older Jeep and using that more frequently as the fuel efficiency isn't really important and fun to take the top and doors off during summer, as well as easier to commute during the worst of winter. That way the 328xi can be preserved a little longer, and I'll use it for some of the longer trips like visiting family and such.


Ok, so it sounds like I'm right about on par with my city MPGs as everyone else then in that range for an AT AWD.
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      06-07-2016, 07:14 PM   #15
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Great thread, I've often wondered the same. Turns out, it seems like I'm right on par as well. Changing your spark plugs might help. Seemed to give my car a bit more pep in town and on the highway.
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      06-07-2016, 07:38 PM   #16
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Quote:
Originally Posted by cybermgm23
Great thread, I've often wondered the same. Turns out, it seems like I'm right on par as well. Changing your spark plugs might help. Seemed to give my car a bit more pep in town and on the highway.
Thanks! Just randomly came to mind.

And yeah I've got all newer plugs, I believe them to be the correct oe spec ones as I researched them at the time, but when I had done them it was due to a blown coil (the rubber coating had completely disintegrated off a quarter sized area) but I was in a tight squeeze and only replaced the one, so I'd like to replace the whole set soon and hopefully that will improve performance slightly also.

I also run one bottle of techron fuel injector cleaner once every 1000 miles which seems to keep things cleaner.
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      06-07-2016, 08:12 PM   #17
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Quote:
Originally Posted by E9Slow View Post
Thanks! Just randomly came to mind.

And yeah I've got all newer plugs, I believe them to be the correct oe spec ones as I researched them at the time, but when I had done them it was due to a blown coil (the rubber coating had completely disintegrated off a quarter sized area) but I was in a tight squeeze and only replaced the one, so I'd like to replace the whole set soon and hopefully that will improve performance slightly also.

I also run one bottle of techron fuel injector cleaner once every 1000 miles which seems to keep things cleaner.
try regapping the plugs to oe specs as well. i've heard stories where the new plugs didn't come gapped to spec.
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      06-07-2016, 08:13 PM   #18
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Quote:
Originally Posted by cybermgm23
Quote:
Originally Posted by E9Slow View Post
Thanks! Just randomly came to mind.

And yeah I've got all newer plugs, I believe them to be the correct oe spec ones as I researched them at the time, but when I had done them it was due to a blown coil (the rubber coating had completely disintegrated off a quarter sized area) but I was in a tight squeeze and only replaced the one, so I'd like to replace the whole set soon and hopefully that will improve performance slightly also.

I also run one bottle of techron fuel injector cleaner once every 1000 miles which seems to keep things cleaner.
try regapping the plugs to oe specs as well. i've heard stories where the new plugs didn't come gapped to spec.
Oh, that I did not do
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      06-07-2016, 08:16 PM   #19
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I put about 12k to 15k a year on my car, about 65% highway. For about 18 months I was averaging 20.6mpg. In the last few months I've been averaging 19.6 but I think it's me as I've been enjoying some of the things I've done to my car a bit more than normal.
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      06-07-2016, 08:43 PM   #20
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22-24- Highway and city combined.
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      06-07-2016, 09:19 PM   #21
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Quote:
Originally Posted by Dan Bilzerian
22-24- Highway and city combined.
I feel like that's a pretty good combined mpg realistically, I'd be happy with that. Just checked mine today on the way home from my dads since I reset it after all my little mods, and it's pretty well averaged out to 19.4 right now.
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      06-07-2016, 09:35 PM   #22
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Quote:
Originally Posted by E9Slow View Post
I feel like that's a pretty good combined mpg realistically, I'd be happy with that. Just checked mine today on the way home from my dads since I reset it after all my little mods, and it's pretty well averaged out to 19.4 right now.
That's not bad, the only things I really have are AFE oiled intake and a 3 stage IM w/ a tune.
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