BMW M3 Forum (E90 E92)

BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read


Go Back   M3Post - BMW M3 Forum > M3 (E90 / E92 / E93) > General M3 Forum (E90 + E92 + E93)
 
BPM Sport
Post Reply
 
Thread Tools Search this Thread
      10-16-2010, 04:53 PM   #1
tomvcarter
First Lieutenant
tomvcarter's Avatar
United Kingdom
17
Rep
348
Posts

 
Drives: bmw E92 M3
Join Date: Jan 2009
Location: LONDON, UK

iTrader: (0)

Send a message via MSN to tomvcarter
What's the most efficient speed?

Hi, has anyone worked out what the most fuel efficient speed to be in Cruise control is? When I'm in the car with the family I try to at least try to be green...
__________________
HRE P40 Wheels (20" Charcoal), BMW Performance ZCP Spoiler & Splitters, Eisenmann Race, BMW Performance Steering Wheel, Carbon Fibre Exterior Trim (Front & Side Grills), Eibach Pro Springs (Not yet fitted).
Appreciate 0
      10-16-2010, 05:23 PM   #2
Radiation Joe
Veni Vidi Vici
Radiation Joe's Avatar
United_States
37
Rep
2,749
Posts

 
Drives: '11 JB/BBe-6sp-e90
Join Date: Jul 2008
Location: Macungie PA

iTrader: (0)

Garage List
2011 e90 M3-Sold  [4.25]
2003 RS6 - Sold  [0.00]
2009 e90 M3 - Gone  [0.00]
2003 M3 SOLD  [0.00]
old 2002  [5.00]
About 50 mph in top gear. The slower you go, the more efficient the car is. I can't do that.
__________________

Dinan compliment of stuff plus PF rotors and RG63s. Enough for now.
Why, yes. I am an abrasive bastard.
Appreciate 0
      10-16-2010, 07:13 PM   #3
bobbyd1961
Banned
26
Rep
2,411
Posts

 
Drives: 2009 M3 sedan LeMans Blue
Join Date: Jun 2009
Location: new jersey

iTrader: (0)

Quote:
Originally Posted by tomvcarter View Post
Hi, has anyone worked out what the most fuel efficient speed to be in Cruise control is? When I'm in the car with the family I try to at least try to be green...
90
Appreciate 0
      10-16-2010, 07:39 PM   #4
Krozi
Colonel
Krozi's Avatar
United_States
49
Rep
2,713
Posts

 
Drives: 2008 E92 ///M3 Alpine White
Join Date: Oct 2009
Location: SoFla - Bonita Springs

iTrader: (22)

1st gear constantly bouncing up and down on the fuel cut-off.
__________________

2008 E92 ///M3 Alpine White//Fox Red//6MT//
Florida Bimmer - Join us on FaceBook!
Appreciate 0
      10-16-2010, 10:32 PM   #5
SPQR M3
First Lieutenant
SPQR M3's Avatar
Australia
9
Rep
328
Posts

 
Drives: 2009 E92 325i
Join Date: Jan 2009
Location: Australia

iTrader: (0)

Standing still with the engine turned off. Best way to be green.
Appreciate 0
      10-16-2010, 11:19 PM   #6
pmeloche
Lieutenant Colonel
pmeloche's Avatar
Canada
17
Rep
1,612
Posts

 
Drives: 2013 F25 X3 xDrive35i
Join Date: Feb 2008
Location: Montréal, Canada

iTrader: (0)

0 is the most fuel-efficient speed since no gas is burned.
__________________

Patrice
2013 F25 X3 xDrive35i Vermillion Red
Appreciate 0
      10-16-2010, 11:47 PM   #7
Krozi
Colonel
Krozi's Avatar
United_States
49
Rep
2,713
Posts

 
Drives: 2008 E92 ///M3 Alpine White
Join Date: Oct 2009
Location: SoFla - Bonita Springs

iTrader: (22)

Quote:
Originally Posted by pmeloche View Post
0 is the most fuel-efficient speed since no gas is burned.
Actually 0mph is the most fuel-inefficient speed because the engine could be on but your not making any progress.
__________________

2008 E92 ///M3 Alpine White//Fox Red//6MT//
Florida Bimmer - Join us on FaceBook!
Appreciate 0
      10-17-2010, 12:29 AM   #8
richardbb85
Major
26
Rep
1,467
Posts

 
Drives: e92 m3
Join Date: Apr 2010
Location: annandale, va

iTrader: (0)

i never cruise in the M
__________________
2011 E92 Space Grey/black + Tech + Premi + Heated Seats
Appreciate 0
      10-17-2010, 03:31 AM   #9
tomvcarter
First Lieutenant
tomvcarter's Avatar
United Kingdom
17
Rep
348
Posts

 
Drives: bmw E92 M3
Join Date: Jan 2009
Location: LONDON, UK

iTrader: (0)

Send a message via MSN to tomvcarter
Still no clue...
__________________
HRE P40 Wheels (20" Charcoal), BMW Performance ZCP Spoiler & Splitters, Eisenmann Race, BMW Performance Steering Wheel, Carbon Fibre Exterior Trim (Front & Side Grills), Eibach Pro Springs (Not yet fitted).
Appreciate 0
      10-17-2010, 04:03 AM   #10
elmariachi
Major
elmariachi's Avatar
48
Rep
1,323
Posts

 
Drives: BMW ///M Division
Join Date: Jan 2007
Location: Singapore

iTrader: (1)

Quote:
Originally Posted by Radiation Joe View Post
About 50 mph in top gear. The slower you go, the more efficient the car is. I can't do that.
Best Answer in this thread!
Hahahahha...Same here mate!
__________________

2008 E92 ///M3 Alpine White M-DCT| Novillo-Black Interior| Carbon Fibre Roof| Premium Sound System| EDC| 19's Advan RS w/ Michelin PS2 Cups| iPod| GruppeM Air Intake| GruppeM Steel Braided Lines|Ferodo DS2500 Pads| Akrapovic Full Header-Back Titanium Exhaust| 6000K Philips D1S| 3M Tints|
Appreciate 0
      10-17-2010, 05:17 AM   #11
joseph328
Private First Class
joseph328's Avatar
3
Rep
155
Posts

 
Drives: 94' E36 M3 Coupe
Join Date: Jul 2009
Location: Slovak Republic

iTrader: (0)

Prius.
__________________
94' E36 M3 Coupe Daytona Violet
Appreciate 0
      10-17-2010, 05:27 AM   #12
xxxryno
New Member
1
Rep
26
Posts

 
Drives: E92 M3
Join Date: Aug 2010
Location: Chicago, IL

iTrader: (0)

55; the study was done decades ago which is why most states have a 55 speed limit.
Appreciate 0
      10-17-2010, 05:50 AM   #13
M3PGH
Lieutenant
United_States
5
Rep
485
Posts

 
Drives: M5
Join Date: Mar 2009
Location: Pittsburgh,PA

iTrader: (0)

I beleive in the M it is 70. There was a thread about it a long time ago
Appreciate 0
      10-17-2010, 09:07 AM   #14
aka_phox
Captain
aka_phox's Avatar
20
Rep
609
Posts

 
Drives: 2011 M3 Convertilble
Join Date: Jun 2010
Location: Italy

iTrader: (0)

between 75 and 90 for me.
Appreciate 0
      10-17-2010, 09:12 AM   #15
///V\3Dude
I Drive Slow To Save Gas :D
///V\3Dude's Avatar
United_States
12
Rep
464
Posts

 
Drives: 08 M3, MY11 STi
Join Date: Jul 2009
Location: I <3 NY

iTrader: (2)

WOT to 55 then cruise
__________________
Appreciate 0
      10-17-2010, 09:31 AM   #16
cawest19
Livin' the M life
United_States
5
Rep
151
Posts

 
Drives: 2008 E90 M3
Join Date: Mar 2010
Location: Princeton, NJ

iTrader: (0)

Actually, it's 76.2361932 mph. I did the math... I would show you the calculations but you would and explode
Appreciate 0
      10-17-2010, 09:47 AM   #17
Dntlvet
Dntlvet
Dntlvet's Avatar
United_States
6
Rep
448
Posts

 
Drives: 10 M3 Sedan,13 GT-R BE,13 Pors
Join Date: Jul 2009
Location: Wisconsin

iTrader: (0)

Actually ~76 is my experience.
Pretty consistent 22.4 mpg.
Appreciate 0
      10-17-2010, 10:26 AM   #18
mdosu
Banned
No_Country
119
Rep
8,517
Posts

 
Drives: Double Vanos'd Civic-M3
Join Date: Oct 2009
Location: San Francisco

iTrader: (6)

Quote:
Originally Posted by Radiation Joe View Post
About 50 mph in top gear. The slower you go, the more efficient the car is. I can't do that.
+1 in this situation on flat ground you'll get about 30 mpg! But your engine speed in a 6MT will be 1500 rpms, so you might be lugging the engine.
http://www.m3post.com/forums/showpos...9&postcount=16

Remember to turn off cruise control when you go up or down a hill and turn off the power button.

When going down the hill, the car actively uses the brakes to adjust the speed, when going up, it may not be the most efficient way of accelerating up to speed.
Appreciate 0
      10-17-2010, 10:26 AM   #19
mdosu
Banned
No_Country
119
Rep
8,517
Posts

 
Drives: Double Vanos'd Civic-M3
Join Date: Oct 2009
Location: San Francisco

iTrader: (6)

Quote:
Originally Posted by cawest19 View Post
Actually, it's 76.2361932 mph. I did the math... I would show you the calculations but you would and explode
I'd like to see this, what would be the mpg for a 6mt?
Appreciate 0
      10-17-2010, 11:22 AM   #20
mocsman
Second Lieutenant
mocsman's Avatar
Philippines
5
Rep
263
Posts

 
Drives: AW E90 M3
Join Date: May 2009
Location: New York

iTrader: (0)

Quote:
Originally Posted by xxxryno View Post
55; the study was done decades ago which is why most states have a 55 speed limit.
not applicable to today's engines anymore. i believe that it's up to 75 now, might be +5-10 mph on our cars. so those who are the most gas mileage conscious m3 owners are the ones getting the tickets
__________________
Appreciate 0
      10-17-2010, 11:41 AM   #21
Dengel
Non-Guido Jersey Resident
Dengel's Avatar
United_States
19
Rep
678
Posts

 
Drives: Slow Jeep Rubicon
Join Date: May 2009
Location: Scottsdale, AZ

iTrader: (3)

Quote:
Originally Posted by Dntlvet View Post
Actually ~76 is my experience.
Pretty consistent 22.4 mpg.
+1 this is your answer right here.
Appreciate 0
      10-17-2010, 12:49 PM   #22
bruce.augenstein@comcast.
Lieutenant Colonel
21
Rep
1,908
Posts

 
Drives: Legacy GT - 13.704@99.39
Join Date: Jul 2007
Location: Manheim, PA

iTrader: (0)

Quote:
Originally Posted by tomvcarter View Post
Hi, has anyone worked out what the most fuel efficient speed to be in Cruise control is? When I'm in the car with the family I try to at least try to be green...
The straight answer is to go as slowly as top gear will permit while the engine is still cruising smoothly.

More speed brings more air and rolling resistance, not to mention that more speed takes more power even without that. More power being used means more fuel is used. Always.

As it's certainly not practical to cruise at, say, 40 mph in top gear out on the highway, just remember that more speed takes more power, and more power takes more fuel.

55 will return better mpg than 70, 100% of the time.

Even 55 is dangerous, though. If you drive down in the 5th percentile, you're just as dangerous as if you were cruising at the 95th percentile, accident-wise. Speed doesn't kill, but speed differential certainly does - meaning the old guy trundling down the road at ten under the limit is just as dangerous as the punk at 25 over.
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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


All times are GMT -5. The time now is 02:12 PM.




m3post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST