Ridiculously horrible gas mileage 128i

[dorkdog]

Originally Posted by 631twentyeighteye

On the left hand stalk by the steering wheel, the one above the cruise control stalk, scroll up on the wheel 2 or 3 times until you see oil, then click on it with the end button. If it shows a reading, i consider my car warmed up. If you just see a sort of loading screen, i consider that not warmed up yet.

That's great to know! I wasn't aware that the display would not popu*ate unti* the temp was up.

Thank you! Now fee*ing embarassed for not RTFM!!!

[TheSt|G]

Originally Posted by dorkdog

That's great to know! I wasn't aware that the display would not popu*ate unti* the temp was up.

Thank you! Now fee*ing embarassed for not RTFM!!!

Also important to note that you can't be moving when you try to get a reading.

You live in PA?

[dorkdog]

Yessir I live in York! You?

[hatepotholez]

[quote=dorkdog;13613822]

Originally Posted by hatepotholez

Running stock size tires, front RF tire is brand new, LF has pretty good thread on it. The tire pressure readings i'm not to sure of but I will definitely check them over. I bought a tire gauge just for this lol!

QUOTE]

Running tires of unequal wear scares me a little. Are they the same type? Apo*ogies if this has been asked before , or since rather...

I was wondering this also, they are newer style Pirelli tires. I will have the shop try to replace the other one, hopefully they will.

[dorkdog]

Assuming un*imited funds, I strong*y recommend rep*acing a** 4 at the same time. I'd rather put 4 cheep tires on and save for a better set than rep*ace one expensive tire...especia**y with a rep*acement of different techno*ogy and tread history.

I don't know what effect 1/2" in diameter difference wou*d make on a car's overa** a*ignment, but I wou*d suspect it to be substantia*.

[hatepotholez]

Originally Posted by dorkdog

Assuming un*imited funds, I strong*y recommend rep*acing a** 4 at the same time. I'd rather put 4 cheep tires on and save for a better set than rep*ace one expensive tire...especia**y with a rep*acement of different techno*ogy and tread history.

I don't know what effect 1/2" in diameter difference wou*d make on a car's overa** a*ignment, but I wou*d suspect it to be substantia*.

I agree, it would be best to swap out all the tires. This will be done when the threads running low. For now I'll try and match the other set if I get approved for it to be pro rated.

[andrey_gta]

I admit my gas mileage is not the lowest as I average in mixed conditions & light spirited sprints to the speed limit about 11.1 l/100. If I am extra bad its closer to 12 l/100. Thats about 21.19 - 19.6 mpg

if I am boring I would assume a mixed 10 l/100. Freeway only, I can cruise near 7.1 l/100 or 33.13 mpg. More realistically its probably 9 l/100 or 26.14 mpg.

In any case I tend to average about 450-500 km between fill ups.

[dorkdog]

Originally Posted by andrey_gta

I admit my gas mileage is not the lowest as I average in mixed conditions & light spirited sprints to the speed limit about 11.1 l/100. If I am extra bad its closer to 12 l/100. Thats about 21.19 - 19.6 mpg

if I am boring I would assume a mixed 10 l/100. Freeway only, I can cruise near 7.1 l/100 or 33.13 mpg. More realistically its probably 9 l/100 or 26.14 mpg.

In any case I tend to average about 450-500 km between fill ups.

Yes that sounds about right for me. I am surprised at how high the mileage can be under the right conditions (driving across Kansas at 55 MPH for instance)

[andrey_gta]

lol, the question is how much of calm driving can you tolerate

[hatepotholez]

Update:

- Opened the hood and noticed the "suction hood" was not connected to the airbox(doubt this will make a difference). Number 14: http://parts.bmwofsouthatlanta.com/s...=0&modelYear=0

-Charcoal and air filter looked clean.
-Replaced the air filter with a Fram unit for now.
-Cleaned the MAF sensor with electronics cleaner
-Sprayed in some intake cleaner.
-Reset throttle adaptation(doubt this will do anything for MPG)

Vehicle has more pep but still guzzling gas. Next would be the plugs, highly unlikely they are bad as the air filter was pretty clean.

This leaves the 02 sensors and possibly the fuel filter/pressure regulator assy. The dealer basically won't do crap if there's no code.

[631twentyeighteye]

reset the MPG thing with the button on the stalk. when i first got my car and couldnt stop speeding around, i got 15mpg everywhere. I would drive 50 miles of highway a day and it wouldnt rise at all. Once i reset it and drove normally, it settled to 25mpg and has stayed there since with a consistent driving style. I remember i had this issue and i completely forgot about it. Not sure if it will fix it but it worked for me. My car only had 25.5k on it when i got it and i did this at probably 26k.

[hatepotholez]

Originally Posted by 631twentyeighteye

reset the MPG thing with the button on the stalk. when i first got my car and couldnt stop speeding around, i got 15mpg everywhere. I would drive 50 miles of highway a day and it wouldnt rise at all. Once i reset it and drove normally, it settled to 25mpg and has stayed there since with a consistent driving style. I remember i had this issue and i completely forgot about it. Not sure if it will fix it but it worked for me. My car only had 25.5k on it when i got it and i did this at probably 26k.

Thx, I usually don't follow the MPG readout but i'll try it. I calculate it by mileage driven and gallons filled up.

[DriveHard]

pm sent....

[Isdaako]

Mine consistently gets 30 mpg on the highway.

[Iron Man]

Originally Posted by hatepotholez

Thx, I usually don't follow the MPG readout but i'll try it. I calculate it by mileage driven and gallons filled up.

That is the best and most accurate way to do it. Just make sure you are consistent in how you fill and top off your tank.

[hatepotholez]

Originally Posted by Iron Man

That is the best and most accurate way to do it. Just make sure you are consistent in how you fill and top off your tank.

thx, I also take pics to compare basically where the needle is and try to match it up.

[hatepotholez]

Originally Posted by DriveHard

pm sent....

Thx!

[dorkdog]

Originally Posted by hatepotholez

thx, I also take pics to compare basically where the needle is and try to match it up.

Not very accurate I'm afraid.

You could get Torque and an ELM327 and see the 'percentage of fuel remaining' (resolved to 0.1 percent) on your phone at anytime while in Bluetooth range...

My app divides GPS miles travelled by Gallons Used. My numbers are somewhat skewed from what the OBC says. Sometimes better, sometimes worse. But generally better than you are getting.

I don't pay much attention to MPG anymore - it's just another indication of overall vehicle health, something good to have when you can't read oil pressure or temp.

Andrey_GTA: not very long. Boring driving is wasted time.

[631twentyeighteye]

When i hand calculated mine it came out to be within .5 miles per gallon of the OBC, so i trust it's fairly accurate.

[hatepotholez]

In the good hands of Drivehard and Dennis over at Rallye!

[atown16]

That is pretty rough, even with getting on it pretty good i get ~230 mi per tank. Sorry to hear that :-/

[hatepotholez]

Long awaited update.

So Alex and Dennis at Rallye BMW really took care of my car, great guys and very knowledgable!

They did the injection service, oil change and upgraded my DME software. The mileage has improved to 16-17 mpg city and this is with my wife driving on and off on the gas pedal. On the highway I see great mpg's sometimes around 30 if driving consistently.

I think the biggest culprate was the dme software. The transmission shifted at a higher rpm and now shifts at a lower rpm.

Overall I am very pleased with the car, and my wife has noticed a great improvement which is relief for me!

I am also considering installing a AFE or Injen intake and an exhaust to maybe boost the mpg a little more, but no final determination hasnt been made yet.

Big thanks to Alex, Dennis, dackelone and the forum!