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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > M Series > E36 M3 (1995-1999)

E36 M3 (1995-1999)

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  #1  
Old 05-22-2014, 06:07 PM
hadless hadless is offline
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Location: Montreal
 
Join Date: May 2014
Posts: 2
Mein Auto: e36 M3
MPG issue

Hello there,
I've recently bought a '97 e36 m3 (my first car as I'm only 19). It's a truly amazing car and everything works well (knock on wood). My only concern is the mpg that the obc is displaying which is 14.5 mpg, I know this is pretty low and that it should average around 20. My question is should I trust the obc? And what should I check that is causing this low mileage ? Hope to get some useful information and tips as I'm new to the forum and to bmw.
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  #2  
Old 05-23-2014, 09:22 AM
theawesomellama theawesomellama is offline
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Location: PA
 
Join Date: Feb 2014
Posts: 6
Mein Auto: 95 M3 Coupe
To figure out if it's telling the truth or not, fill up your gas tank and reset the trip. Then, when you are low and need to fill again, divide the total number of miles by the amount of new fuel you put in. This should give you your MPG. Example = (410 miles / 15.52 gallons of fuel = 26.4 MPG)

Hope this helps.
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  #3  
Old 06-07-2014, 08:30 PM
SwimNDrive SwimNDrive is offline
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Location: California
 
Join Date: Apr 2012
Posts: 12
Mein Auto: 1997 BMW M3 Coupe
Quote:
Originally Posted by hadless View Post
Hello there,
I've recently bought a '97 e36 m3 (my first car as I'm only 19). It's a truly amazing car and everything works well (knock on wood). My only concern is the mpg that the obc is displaying which is 14.5 mpg, I know this is pretty low and that it should average around 20. My question is should I trust the obc? And what should I check that is causing this low mileage ? Hope to get some useful information and tips as I'm new to the forum and to bmw.
Try the good old fashion mpg calculation as mentioned by "theawesomellama" first. If the results matched you OBC, your car is not running as good as it should be. Or your driving habits need to be changed.

My car has almost 210K miles on the clock. I normally average at 24-26 mpg, but my 20 year old son will lower that to 22. You young guys drive the car hard all the time. That burns more fuel in case you don't know it.

My car had lower mpg few months ago, 20-22. After a big tune up, mpg noticeably improved and the car runs much better too. I changed the plugs, engine oil, valve cover gasket, PVC, vacuum lines, pulleys, fuel filter, air filter, pre Cat O2 sensors and SAP and valve. I cleaned up ICV, fuel injection, MAF sensor, throttle body, ignition coil contacts, and seaformed the intake, engine oil and fuel tank. May be more but these are as far as I can remember for now, but you can read it from this thread:

http://www.m3forum.net/m3forum/showthread.php?t=468974

I did these for passing smog test. However, it improves mpg and the over all performance of the car. With some basic tools, you can DIY on all of these. Help info is available on this forum and others. Try it, it is very rewarding.

Last edited by SwimNDrive; 06-07-2014 at 08:39 PM.
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  #4  
Old 06-08-2014, 08:57 AM
hadless hadless is offline
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Location: Montreal
 
Join Date: May 2014
Posts: 2
Mein Auto: e36 M3
Thank you very much SwimNDrive, i did the old fashioned mpg test and it averaged at 20 mpg. I definitely need to do most of the cleaning and replacement you mentioned. thanks again for giving the issues that could cause the bad mpg.
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  #5  
Old 06-12-2014, 10:11 PM
SwimNDrive SwimNDrive is offline
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Location: California
 
Join Date: Apr 2012
Posts: 12
Mein Auto: 1997 BMW M3 Coupe
Quote:
Originally Posted by hadless View Post
Thank you very much SwimNDrive, i did the old fashioned mpg test and it averaged at 20 mpg. I definitely need to do most of the cleaning and replacement you mentioned. thanks again for giving the issues that could cause the bad mpg.
Try to reset the counter on your OBC, if you have not done so for a while. The OBC data is an average of accumulative driving. After you reset the mpg counter, it will give you a chance to compare the OBC data with the old fashion way of the calculation. They should be close.
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  #6  
Old 06-13-2014, 09:13 AM
RyanMac RyanMac is offline
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Location: North Carolina
 
Join Date: May 2014
Posts: 64
Mein Auto: 2008 328i
I was about to mention the above.
Where you drive can sometimes be just as important. If most of your driving is on city streets (45 mph and below) with stops, and traffic lights, etc. You will not average as well as if the majority of your daily drive is highway miles.
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  #7  
Old 06-28-2014, 01:43 PM
pantdino pantdino is offline
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Location: Los Angeles
 
Join Date: Jun 2014
Posts: 8
Mein Auto: 1995 M3
My '95 w 180K miles gets about 16.5 in city stoplight-to-stoplight driving and 28-32 at a steady 65mph on the expressway (you can reset the OBC as often as you like to see what you get for a certain condition or trip). My average in commuting to work is about 19 and has been for the 14 years I've owned the car.
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