fuel economy - BMW Forum - BimmerWerkz.com
3-Series (E46, E90) Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.

 
LinkBack Thread Tools Display Modes
#1 (permalink) Old 09-13-2009, 07:40 PM
n00b
 
Join Date: Aug 2009
Location: Tucson AZ
Posts: 45
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
kohlers is on a distinguished road
(Thread Starter)
Thumbs down fuel economy

Today I filled my tank from 1/4 with 87 octane. I did not notice any difference in performance from 91. I am new to BMW, only about 500 miles in my 2000 323i. Now I would like to know if someone has any numbers for MPG with 87 versus 91 octane.
kohlers is offline  
Sponsored Links
Advertisement
 
#2 (permalink) Old 09-13-2009, 08:03 PM
n00b
 
Join Date: Aug 2009
Location: Tucson AZ
Posts: 45
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
kohlers is on a distinguished road
(Thread Starter)
OK, guys after I submitted the above I found a whole lot of discussions of 91 vs 87 etc. Much of it seemed very uninformed. Well, on my fuel-door it recommends 91 but do not go below 87. The engine adjusts the timing automatically to the octane. Certainly 91 gives better performance for those who need it. I do not. The question is MPG. The difference in price between 91 and 87
may or may not make 87 more economical. 87 will NOT hurt the engine at least not mine.
kohlers is offline  
#3 (permalink) Old 09-13-2009, 09:00 PM
Pandemonium Director
 
nukeduster's Avatar
 
Join Date: Mar 2005
Location: Scottsdale, Arizona
Posts: 2,372
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
nukeduster has a reputation beyond repute nukeduster has a reputation beyond repute nukeduster has a reputation beyond repute nukeduster has a reputation beyond repute nukeduster has a reputation beyond repute nukeduster has a reputation beyond repute nukeduster has a reputation beyond repute nukeduster has a reputation beyond repute nukeduster has a reputation beyond repute nukeduster has a reputation beyond repute nukeduster has a reputation beyond repute
Send a message via AIM to nukeduster Send a message via MSN to nukeduster
It can, just like oil brands, this has been beat to death 1 million times before on 1 million car forums. No one will ever agree, because everyones opinion is stated as fact, because someones friend of a friend is a scientist for some super lab somewhere who knows whats best. Whatever works for you, whatever brand makes you get the best mpg, is what works best for you. I personally use shell V power 91 octane fuel. I get the best economy and power with it compared to other brands and octane ratings. YMMV.

nukeduster is offline  
#4 (permalink) Old 09-13-2009, 09:37 PM
n00b
 
Join Date: Aug 2009
Location: Tucson AZ
Posts: 45
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
kohlers is on a distinguished road
(Thread Starter)
Thanks, I believe you. I think what you are saying is that octane rating is not all. The additives used by various companies makes a difference too, especially in a high compression engine like the BMW.
Sorry, I have only been on this (or any other) forum for a couple of weeks and did not know of past discussions.
I think I saw someone found 87 to decrease MPG by 2 which is roughly 10%. Price difference between 87 and 91 is about the same, 10% so it seems just as well to use 91 ( and a good brand gasoline). Thanks.
kohlers is offline  
#5 (permalink) Old 09-13-2009, 09:49 PM
Ich bin der Modifikator
 
johnnyBgood's Avatar
 
Join Date: Sep 2007
Location: Bayonne, NJ
Posts: 3,325
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
johnnyBgood is a jewel in the rough johnnyBgood is a jewel in the rough johnnyBgood is a jewel in the rough
Garage
Quote:
Originally Posted by nukeduster View Post
It can, just like oil brands, this has been beat to death 1 million times before on 1 million car forums. No one will ever agree, because everyones opinion is stated as fact, because someones friend of a friend is a scientist for some super lab somewhere who knows whats best. Whatever works for you, whatever brand makes you get the best mpg, is what works best for you. I personally use shell V power 91 octane fuel. I get the best economy and power with it compared to other brands and octane ratings. YMMV.
+1^

______________________________________
_______________________97 E36|Conforti Software|M50 Manifold|AFE|Borla|H&R| Bilstein |Eibach|Rockford|3.15 LSD
____________________________________________http://www.cardomain.com/ride/3129109
johnnyBgood is offline  
#6 (permalink) Old 09-14-2009, 01:46 PM
n00b
 
Join Date: Oct 2005
Posts: 14
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
RDroz is on a distinguished road
Tucson is over 2000' above sea level. Your car won't make as much horsepower there as at sea level as the air is thinner. You likely can run fully advanced timing on any grade of gasoline, so you won't see a drop in mpg or a change in performance.
RDroz is offline  
#7 (permalink) Old 09-15-2009, 12:44 PM
n00b
 
Join Date: Aug 2009
Location: Tucson AZ
Posts: 45
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
kohlers is on a distinguished road
(Thread Starter)
Thank you RDroz. Reduced performance at altitude I know from flying my plane (non-turbo). But I do a lot of sea-level driving so I would still like to know if someone has any fuel-burn numbers for 87 vs 91 grade.
kohlers is offline  
Sponsored Links
Advertisement
 
Reply

  BMW Forum - BimmerWerkz.com > BMW Model Specific Forums > 3-Series (E46, E90)


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
Improving Fuel Economy Gkamysz 3-Series (E36) 19 07-31-2008 10:03 AM
Fuel Economy lindendavies 3-Series (E46, E90) 7 03-08-2005 08:10 PM
Fuel Economy zacspeed 3-Series (E36) 6 07-04-2004 12:57 PM
fuel economy '89 750iL V12 Barefoot Bushman 1,6,7,8 - Series and Mini Cooper 2 12-03-2003 05:28 AM

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome