Go Back   United Bimmer Community - BMW Forum > UnitedBimmer-General BMW Topics > BMW General Discussion
FAQ Members List Calendar Advertise With Us Mark Forums Read

BMW General Discussion Sponsored by: AutohausAZ.com
Talk about BMWs in general. Post official news, Bangle flames, or anything else related to BMW.

Reply
 
Thread Tools
Old 01-12-2008, 06:56 AM   #1
3050rpm
 
3050rpm's Avatar

Name: 3050rpm
Title: Senior Member
Status: Offline
Join Date: Jul 2006
User not setup in Rate My Car.
Click here to set it up.
Your Ride: 1995 325i
(Not) Going the Extra Mile

Any suggestions as to what may be causing a sudden, small, but significant drop in fuel economy? I do a fair amount of steady highway driving, generally setting the cruise control between 70 and 75, and I had routinely been getting about 31+ mpg ('95 325i, 5-speed). Since November, however, over the same routes, I've only been getting ~29 mpg, a small but noticeable a 6-7% drop. The car has been running fine and smooth, the idle behaving as it should, tire inflation at 32 psi, oil changes at regular intervals, air and fuel filters replaced last spring. I've heard that colder weather adversely affects fuel economy (longer time to reach operating temp., denser air), but it really hasn't been all that bad where I live; also, winter formulations to make gasoline more volatile in winter can lead to decreased fuel economy, but I rather doubt all that much.

Again, this came about suddenly, which leads me to think that something mechanical went out of whack, as opposed to a gradual decrease over time. Possibly a vacuum leak? Thoughts, suggestions appreciated.
  Reply With Quote
Old 01-12-2008, 12:18 PM   #2
gldfshkpr
 
gldfshkpr's Avatar

Name: gldfshkpr
Title: Member
Status: Offline
Join Date: Nov 2007
Location: CA
User not setup in Rate My Car.
Click here to set it up.
Your Ride: '97 318i M44 - Sedan
Do you buy gas from the same station? I've heard that during Winter months, stations are allowed to use more ethanol in the mix causing less M.P.G.
__________________
Peace,
Kirk


Hang up and drive.
  Reply With Quote
Old 01-12-2008, 05:04 PM   #3
3050rpm
 
3050rpm's Avatar

Name: 3050rpm
Title: Senior Member
Status: Offline
Join Date: Jul 2006
User not setup in Rate My Car.
Click here to set it up.
Your Ride: 1995 325i
Ah-ha, yes I do, and coincidentally enough on those occasions where I have tanked up at other gas stations, they have the sticker saying "10% ethanol" on the pump, so thanks, mystery may be solved. Although that brings up a further point, we're paying quite high prices for gas as it is, and yet we're getting less for it, which means that gas (fuel) is on the order of 6% or so more costly than the posted price because it is 6% or so less efficient. Ugh.
  Reply With Quote
Old 01-12-2008, 05:42 PM   #4
Exilion
 
Exilion's Avatar

Name: Exilion
Title: Senior Member
Status: Offline
Join Date: Oct 2006
Location: World wide
User not setup in Rate My Car.
Click here to set it up.
Your Ride: 1991 325i
dont forget the 10% that isnt oil!!
__________________


BMW's are made by god... kinda
  Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
130 thousand mile control arm Picture Numark318i Tire, Wheels And Suspension Forum 7 12-07-2007 05:23 PM
extra security problem xakeri E36 7 10-12-2007 11:58 AM
1/4 mile time - 88 M3 MPowered E21, E30 34 02-09-2007 09:02 AM
Want to sell your extra Peake Reset tool? 1994-325i Bmw Cars For Sale/Wanted 0 10-29-2006 09:33 PM
90k mile tune up BombSquad E36 1 04-28-2005 12:09 AM


All times are GMT -5. The time now is 01:59 AM.

A vBSkinworks Design

 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Copyright © 2005-2013 UnitedBimmer.com