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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > My E92 got 33.2 mpg over 115 miles into Boston



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      05-10-2007, 10:48 AM   #23
NewhouseEnt
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??

I'm sorry, I have a real hard time believing those numbers. Too many people reset their 'Average MPG' computer and then watch that. The BMW PC is notoriously silly, changing constantly from 5mpg to 99mpg.
The only real way to get the average is pen and paper. Fill up, drive that same scenario and then fill up again, then do the math.
I have not gotten better than 21.2 ever, and I have 11,000 miles. That was driving fairly normally, no A/C. My overall averages per tank are about 17.8 - 18.5
I'd like to hear Shiv's opinion on a 300HP car gettting 30+ mpg.
Anyone agree?
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      05-10-2007, 11:28 AM   #24
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Just for reference we drove from florida to boston this past weekend and over what came out to about 1400 miles, the car read ~29 MPG for the vast majority of the ride, and got up to ~30 MPG when we got further north and didn't have AC on as much. Average speed was around 72 mph and this was in a 330i sedan with about 11k miles
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      05-10-2007, 11:56 AM   #25
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Quote:
Originally Posted by NewhouseEnt View Post
I'm sorry, I have a real hard time believing those numbers. Too many people reset their 'Average MPG' computer and then watch that. The BMW PC is notoriously silly, changing constantly from 5mpg to 99mpg.
The only real way to get the average is pen and paper. Fill up, drive that same scenario and then fill up again, then do the math.
I have not gotten better than 21.2 ever, and I have 11,000 miles. That was driving fairly normally, no A/C. My overall averages per tank are about 17.8 - 18.5
I'd like to hear Shiv's opinion on a 300HP car gettting 30+ mpg.
Anyone agree?
The piggybacks (PROcede for sure, Xede probably also) increase cruising fuel economy. Shiv, IIRC, got 35mpg on an extended freeway trip.
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      05-10-2007, 12:16 PM   #26
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I having been getting better and better mileage. At 4000 miles I'm getting 30mph on a weekly trip from the DC Metro area to the Delaware shore, about 130 miles averaging 60 mph in lots of different traffic etc.
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      05-10-2007, 12:23 PM   #27
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Quote:
Originally Posted by NewhouseEnt View Post
I'm sorry, I have a real hard time believing those numbers. Too many people reset their 'Average MPG' computer and then watch that. The BMW PC is notoriously silly, changing constantly from 5mpg to 99mpg.
The only real way to get the average is pen and paper. Fill up, drive that same scenario and then fill up again, then do the math.
I have not gotten better than 21.2 ever, and I have 11,000 miles. That was driving fairly normally, no A/C. My overall averages per tank are about 17.8 - 18.5
I'd like to hear Shiv's opinion on a 300HP car gettting 30+ mpg.
Anyone agree?
I get exactly 21.1 on a mix of 85% hwy and 15% city driving (about 1700mi so far). It doesn't seem to want to go up or down.
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      05-10-2007, 05:33 PM   #28
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Quote:
Originally Posted by Corey View Post
Connecticut state police are the WORST. I respect the police and all they do for us but the CT troopers are seriously out of control. To make a really long story slightly shorter, my sister's friend got pulled over on 74 in Tolland (right outside the troop C barracks) for DUI, he blew over the limit so they took him in. Ok that's fine, drunk driving is stupid. So he sits in a cell for a few hours then they tell him he's free to go so he calls my sister to come pick him up. She gets there and before they will let her take the friend they ask for her license. The cop goes back to his office, comes back 10 minutes later and says it checked out. She goes to take her license back and he says she has to take a breathalizer first. She says no, she's not drunk (keep in mind it's like 7am and she's in her pajamas cause she was just getting up to go to work when he called). So finally she walks the line and whatever, passes everything with ease. She goes to get her license again and he says he wants to run it one more time. He goes back to his office again, comes back 10 minutes later and tells her that her license has been suspended since 2004 yet somehow he didn't notice this the first time he ran the check??? She says it's bullshit and he threatens to throw her in the holding cells with her friend, then says she can't leave her car outside and since she can't move it with a suspended license he's going to have it towed. She says she'll call her mom to come bring it back home (who lives about a mile away) and he says no, it's being towed. He writes her up for driving with a suspended license and gives her a court date then lets her call her mom to come pick her and the friend up finally.
Fast forward a few weeks, she shows up the court date with documentation of everything she had, proof from the DMV that her license wasn't suspended at all, etc. etc. blah blah blah long story short the judge tells her the entire CT state police is corrupt as fuck and drops EVERYTHING on her and she STILL has to pay $60 to get a new license from the DMV cause the asshole cop never gave hers back.

/end rant about ct state police :mad: :mad: :mad: :mad: :mad: :mad: :mad:


Wow...thats fucking rediculous. Well..next time I meet someone up in CT, Im taking the slow route.
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      05-10-2007, 08:57 PM   #29
NewhouseEnt
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"I get exactly 21.1 on a mix of 85% hwy and 15% city driving (about 1700mi so far). It doesn't seem to want to go up or down."

That sounds right on the money. That is my findings as driven. I still say the 30 + mpg is staring at the BMW computer and not done by pen and paper.
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      05-10-2007, 09:29 PM   #30
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Quote:
Originally Posted by Spool View Post
Drive like a man...

If you avg more than 18mpg, you drive like a sissy
LOL nice
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      05-10-2007, 09:50 PM   #31
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Quote:
Originally Posted by NewhouseEnt View Post
I'm sorry, I have a real hard time believing those numbers. Too many people reset their 'Average MPG' computer and then watch that. The BMW PC is notoriously silly, changing constantly from 5mpg to 99mpg.
The only real way to get the average is pen and paper. Fill up, drive that same scenario and then fill up again, then do the math.
I have not gotten better than 21.2 ever, and I have 11,000 miles. That was driving fairly normally, no A/C. My overall averages per tank are about 17.8 - 18.5
I'd like to hear Shiv's opinion on a 300HP car gettting 30+ mpg.
Anyone agree?
driving normally does not mean 80mph. driving 55 in the right lane on the highway constantly will EASILY get you over 30mpg. i'm talking no problem. my dad drives like that in his 330Ci and he averages 34mpg. hell in my e30 i usually get around 30 if i'm not going too fast on the highway.

city/traffic/flooring it/driving moderately fast obviously is a different story, but i'm talking just open freeway here.
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      05-11-2007, 08:33 PM   #32
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I too would not trust the onboard computer on the car. (At least for my E90). The reading on my E90 has been way too optimistic on the fuel consumption reading. My actual fuel consumption is about 30% more than what the computer says. Maybe there's a problem with my fuel consumption meter but I would not place 100% trust on the computer itself. Confirm your results by manually calculating the fuel consumption.
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      05-11-2007, 10:50 PM   #33
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Quote:
Originally Posted by tctic View Post
The reading on my E90 has been way too optimistic on the fuel consumption reading. My actual fuel consumption is about 30% more than what the computer says.
At 30%, your computer is certainly broken. False readings could indicate other problems with your car.

Mine reads 5% off at most.
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      05-13-2007, 03:03 PM   #34
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Good Christ

H.Christ.

Will anyone do the pen-and-paper-method with highway only driving so we all know once and for all? No such highway exists where I live, or I'd do it.

REALLY nice if someone would do what I do and post pix of odometer readings before-and-after with the gas receipts. Doesn't take that much effort.
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      05-14-2007, 07:11 AM   #35
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I've been tracking mpg since new (~8500miles) -- my BC reads between 0-1mpg higher than pen/paper, generally only 0.5mpg off (2% error). A couple weekends ago I helped a friend move, and the 120 miles at 60-70mph (trailing the moving van), with gas stops at the beginning and end to measure mpg I got 34 for the trip (0 BC error). Normally, I get a consistent 21mpg per tank with mixed leadfoot/lightfoot.
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      05-14-2007, 11:47 AM   #36
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Quote:
I'd like to hear Shiv's opinion on a 300HP car gettting 30+ mpg.
Anyone agree?
Horsepower doesn't really directly equate to fuel economy...a C6 vette has considerably more hp than a 335 and is capable of 30+mph on the highway.
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      05-14-2007, 05:34 PM   #37
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Doesn't matter

I think most people will agree, none of the highway only/ street only mpg matters.

It's how many miles you get overall and how many miles you drove before filling up that counts. If you live in the Ozarks and do 98% highway you'll get what you get, but I seriously doubt it will be 500+ miles to the 335i's tank.

For the rest of us who live in the cities and suburbs, we're clearing 270-310 miles to fill ups. That is the number that matters.
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      05-15-2007, 12:35 AM   #38
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One of the car mags did a test with the 330i. They drove a constant 60 mph, 65, 70,75, and 80. For every 5 mph over 60 they went their mpg went down about 10%. In a 330i they achieved 39 mpg at a constant 60 mph, and it decreased 10% from there (to 35, then 32 at 70, 29 at 75, etc).

This just has to do with aerodynamics (every increase in speed increases air friction by x squared) plus gearing (higher rpms = more engine braking = friction).

So 35 MPG at a stead 60 is very likely. But it is also a waste of a $45K performance car!
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      05-16-2007, 09:01 PM   #39
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People who say the figures came from the onboard computer are correct, the figure I posted was indeed from that source. I have not done the pen and paper test. I recall that the computer does not count fuel used when completely stopped in the total average mpg, so for people who have that kind of commute it will probably overestimate the mpg compared with reality. However, my trip did not include any completely stopped traffic so I have no reason to disbelieve it.
I also think that this represents good engineering and efficiency - that I respect (nearly) as much as the good performance that I can only use when the traffic is not just moving along at steady 60-70.
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      05-18-2007, 11:21 AM   #40
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Quote:
Originally Posted by Deveray View Post
People who say the figures came from the onboard computer are correct, the figure I posted was indeed from that source. I have not done the pen and paper test. I recall that the computer does not count fuel used when completely stopped in the total average mpg, so for people who have that kind of commute it will probably overestimate the mpg compared with reality. However, my trip did not include any completely stopped traffic so I have no reason to disbelieve it.
I also think that this represents good engineering and efficiency - that I respect (nearly) as much as the good performance that I can only use when the traffic is not just moving along at steady 60-70.
The car does count fuel used while stopped. If you want to confirm this yourself, reset the 'average fuel consumption' meter and then when you come to a stop, you'll see the mpg reading drop.
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      05-18-2007, 11:23 AM   #41
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Originally Posted by zenmaster View Post
At 30%, your computer is certainly broken. False readings could indicate other problems with your car.

Mine reads 5% off at most.
The way that my car calculates average consumption is correct. From obtaining info in the hidden OBC accessed via the dash, it seems that the computer is recording less fuel consumed than the car actually is therefore causing the computer to show a constant 30% offset error.
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      05-18-2007, 05:01 PM   #42
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How do you figure?

Quote:
Originally Posted by tctic View Post
The way that my car calculates average consumption is correct. From obtaining info in the hidden OBC accessed via the dash, it seems that the computer is recording less fuel consumed than the car actually is therefore causing the computer to show a constant 30% offset error.
It's correct yet 30% off?
Must be the new math.

IIRC the system is sent data from the engine management system as to fuel used as measured by the injector open duration and pressure. So that must be a very accurate number or your engine is running very poorly. Other side of the calc is distance traveled, and as these cars have an optomistic speed indication perhaps that is where the error is, but not to a 30% error.

BTW, on M5board a user has listed the hidden menus and how to access them:

http://www.m5board.com/vbulletin/showthread.php?t=96047

You will find a link that shows how to access the hidden OBC, IDrive, and Nav menus. Post number 7 outlines how to correct your MPG calc errors.

Last edited by Vanderfan; 05-18-2007 at 05:23 PM.
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      05-19-2007, 04:20 PM   #43
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15.0 MPG for me, only difference is that my computer is ACCURATE.
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      05-19-2007, 04:22 PM   #44
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Didn't want to hijack this thread so I started a new one specifically on this issue: http://www.e90post.com/forums/showthread.php?t=62449
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