Using Highway grade for fuel economy. - Fuelly Forums

Android Users - Coming Soon! - Migrating from aCar 4.8 to 5.0

Reply
 
Thread Tools Display Modes
 
Old 08-07-2006, 01:03 PM   #1
Registered Member
 
Join Date: Mar 2006
Posts: 675
Country: United States
Using Highway grade for fuel economy.

Ok, I have a question, which may have been answered somewhere, sometime, already, so bear with me.

In driving down the freeway, with a vacume gauge, it is clear that the highway's are not really flat, in most cases and that their are constant very minor slopes which an average driver never even notices. In driving with a light foot, it seems to me that it should be much more fuel effective, to keep the throttle at a lean setting, which on a slight slope will cause the car to slow, imperceptibly. However, when you get to the down side of the slope, the slight change, allows the vehicle to pick back up a little bit of speed.

The consequence is that if you can handle driving +5 to -5, it seems to me like you should be able to do better on mileage.

Taking this notion one step further, it seems to me like on longer up's or down's, if it is necessary to change the throttle position, it would be better to accelerate down the grade and just maintain, or slightly loose speed on the up grade.

Has anyone done any testing on this sort of circumstance's, or drawn any general conclusion's which might be insightful?
__________________

Gary Palmer is offline   Reply With Quote
Old 08-07-2006, 02:08 PM   #2
Registered Member
 
JanGeo's Avatar
 
Join Date: Jan 2006
Posts: 2,442
Country: United States
Send a message via Yahoo to JanGeo
If you run with a scangauge or equilivent you could try that and backing off up the hills definately helps keep the MPG up there. Question will be how pissed off the people behind you will get.
__________________

JanGeo is offline   Reply With Quote
Old 08-07-2006, 04:27 PM   #3
*shrug*
 
Join Date: Sep 2005
Posts: 6,195
Country: United States
This is what we like to call DWL, for Driving with Load, and you're right on the nose. I always practice it,
SVOboy is offline   Reply With Quote
Old 08-07-2006, 06:40 PM   #4
Registered Member
 
kickflipjr's Avatar
 
Join Date: Sep 2005
Posts: 933
Country: United States
Driving with load : I do that all the time. fast down / slow up
__________________
2008 EPA adjusted:


Distance traveled by bicycle in 2007= 1,830ish miles
Average commute speed=25mph (yes, that's in a car)
kickflipjr is offline   Reply With Quote
Old 08-08-2006, 09:16 AM   #5
Registered Member
 
Join Date: Mar 2006
Posts: 675
Country: United States
DWL? We don't have a fine term like codfishing, that's just not right!
Gary Palmer is offline   Reply With Quote
Old 08-08-2006, 12:01 PM   #6
Registered Member
 
The Toecutter's Avatar
 
Join Date: Mar 2006
Posts: 612
Country: United States
Send a message via AIM to The Toecutter
Quote:
Question will be how pissed off the people behind you will get.
I think we can all agree that the venerable middle finger has a much too perspicuous role to play in dealing with such an exacerbated contingent like your ordinary driver.
The Toecutter is offline   Reply With Quote
Old 08-08-2006, 06:00 PM   #7
Registered Member
 
Join Date: Apr 2006
Posts: 270
Country: United States
Send a message via AIM to molecule
i know i've lived in the city too long when i use my middle finger
its time to hit the country up again
__________________
BE ZEITGEISTED
molecule is offline   Reply With Quote
Old 08-08-2006, 06:58 PM   #8
Registered Member
 
MetroMPG's Avatar
 
Join Date: Dec 2005
Posts: 4,223
Country: United States
Quote:
Originally Posted by Gary Palmer
DWL? We don't have a fine term like codfishing, that's just not right!
Agreed! Where's Metro95 when you need him
__________________

MetroMPG is offline   Reply With Quote
Reply

Thread Tools
Display Modes

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 Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Missing Fuelup jmonty Fuelly Web Support and Community News 3 05-27-2009 05:10 AM
fuel-up entry suggestion fugalaya Fuelly Web Support and Community News 3 04-12-2009 09:29 AM
Pulse and Glide? Pete7874 General Fuel Topics 24 02-26-2009 12:11 PM
MID Install SVOboy Experiments, Modifications and DIY 33 06-04-2007 11:27 AM
State of the Union address touches on "oil addiction." Matt Timion General Discussion (Off-Topic) 31 02-06-2006 04:38 PM

Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 04:53 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.