Go Back   EcoModder Forum > Off-Topic > The Lounge
Register Now
 Register Now
 


Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 07-01-2008, 12:05 PM   #1 (permalink)
EcoModding Apprentice
 
Join Date: Dec 2007
Location: Ventura, Ca
Posts: 112

Whoop's Wheels - '89 Honda Civic Wagovan
90 day: 39.09 mpg (US)
Thanks: 1
Thanked 9 Times in 7 Posts
Turtle Mileage; Mythbuster?

All right, I would like some help.

My wife told me that she was watching a program where they claimed that washing your car and waxing it was something people should do, to get better gas mileage.

She said the program claimed that their is a 7% improvement in mileage, if you wash your car and keep it waxed.

I would not doubt that their might be a improvement, but their is no way that I can believe it would be 7%. I think the article was sponsored by Turtle Wax?

Does anyone have any ideas of what this figure might really be?

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 07-01-2008, 12:13 PM   #2 (permalink)
Harebrained Idea Skeptic
 
Join Date: Jun 2008
Location: Alpharetta, GA
Posts: 211

The White Car - '84 Mercedes-Benz 300td
90 day: 28.84 mpg (US)

The Blue Car - '86 BMW 535i
Last 3: 23.86 mpg (US)
Thanks: 18
Thanked 13 Times in 9 Posts
Aside from removing large chunks of mud, washing and waxing will get you essentially nothing other than a psychological "improvement" in MPG. Cars are affected almost entirely by pressure drag, not friction drag. Washing and waxing does nothing for the former, but can be significant for the latter. Any improvement would probably be less than half a percent.
__________________

  Reply With Quote
Old 07-01-2008, 04:17 PM   #3 (permalink)
EcoModding Apprentice
 
Join Date: Jan 2008
Location: kansas city, MO
Posts: 103

Hyundai Accent - '01 Hyundai Accent
90 day: 38.4 mpg (US)

Gixer - '97 Suzuki GSXR600
90 day: 43.12 mpg (US)
Thanks: 2
Thanked 0 Times in 0 Posts
In my aviation classes we learned that a layer of frost the thickness of sandpaper on your wings will increase drag 40%, a fairly significant amount. Of course that would be a heck of a lot of dirt to get a layer that thick. Not to mention that drag increases exponentially with velocity, and the planes we fly cruise at around 120mph.

So I would venture to say that it would help, but not even enough to pay for the washing and waxing. My car is pretty dirty right now, maybe I'll test it out.
__________________
  Reply With Quote
Old 07-01-2008, 04:42 PM   #4 (permalink)
Harebrained Idea Skeptic
 
Join Date: Jun 2008
Location: Alpharetta, GA
Posts: 211

The White Car - '84 Mercedes-Benz 300td
90 day: 28.84 mpg (US)

The Blue Car - '86 BMW 535i
Last 3: 23.86 mpg (US)
Thanks: 18
Thanked 13 Times in 9 Posts
Quote:
Originally Posted by jesse.rizzo View Post
In my aviation classes we learned that a layer of frost the thickness of sandpaper on your wings will increase drag 40%, a fairly significant amount. Of course that would be a heck of a lot of dirt to get a layer that thick. Not to mention that drag increases exponentially with velocity, and the planes we fly cruise at around 120mph.

So I would venture to say that it would help, but not even enough to pay for the washing and waxing. My car is pretty dirty right now, maybe I'll test it out.
Yes, BUT as I said -- friction drag on cars is negligible. Friction drag on aircraft is NOT negligible. It's not the same situation.
__________________

  Reply With Quote
Old 07-01-2008, 04:48 PM   #5 (permalink)
Veggiedynamics
 
Join Date: May 2008
Location: Alexandria, MN
Posts: 684

Volt12 - '12 Chevy Volt base
Thanks: 0
Thanked 12 Times in 10 Posts
it really is amazing how much resistance picks up over say 60 mph.. riding a motorcycle really educates you on the increases of wind resistance in faster speeds.. cant even imagine these land speed motorcycle guys..
__________________

  Reply With Quote
Old 07-01-2008, 05:31 PM   #6 (permalink)
Pokémoderator
 
cfg83's Avatar
 
Join Date: Dec 2007
Location: Southern California
Posts: 5,864

1999 Saturn SW2 - '99 Saturn SW2 Wagon
Team Saturn
90 day: 40.49 mpg (US)
Thanks: 439
Thanked 528 Times in 355 Posts
ebacherville -

Quote:
Originally Posted by ebacherville View Post
it really is amazing how much resistance picks up over say 60 mph.. riding a motorcycle really educates you on the increases of wind resistance in faster speeds.. cant even imagine these land speed motorcycle guys..
Hmmmmm. *If* I was interested in the best MPG at 70 MPH (65 MPH Max + 5 MPH over), then maybe a wash and wax would just barely begin to help?

CarloSW2
__________________

What's your EPA MPG? Go Here and find out!
American Solar Energy Society
  Reply With Quote
Old 07-01-2008, 06:39 PM   #7 (permalink)
FumeSniffer
 
cookie96civic's Avatar
 
Join Date: Jun 2008
Location: Zeeland, Michigan
Posts: 27

FumeSniffer - '96 Honda Civic DX
90 day: 46.19 mpg (US)

Big Gulp - '06 International 8600-375 Twin Turbo
90 day: 7.15 mpg (US)
Thanks: 0
Thanked 0 Times in 0 Posts
It must be right, I rinsed the sawdust off my car, easily a 9-12 mpg improvement. Oh yeah, looks like the water must have freed the e-brake too, sweet.
  Reply With Quote
Old 07-01-2008, 07:35 PM   #8 (permalink)
Recycling Nazi
 
Bror Jace's Avatar
 
Join Date: May 2008
Location: People's Republic of Albany
Posts: 234

Blue Bullet - '06 Honda Civic Sedan LX
90 day: 35.68 mpg (US)
Thanks: 2
Thanked 7 Times in 7 Posts
Arrow

"drag increases exponentially with velocity"

That's the key. Spend lots of time at or above 100mph? Then washing and waxing becomes crucial. I'm always amazed when I look at older aircraft with exposed rivets, etc ... what a waste of efficiency!
__________________
--- Bror Jace
  Reply With Quote
Old 07-02-2008, 12:30 AM   #9 (permalink)
EcoModding Lurker
 
Join Date: Mar 2008
Location: USA
Posts: 70
Thanks: 0
Thanked 1 Time in 1 Post
I don't think you'll see a noticable difference after washing/waxing.

I just got my best tank ever (44+), and my car is VERY dirty.
__________________



*Time period is from 1 January 2006 - 1 March 2007*
  Reply With Quote
Old 07-02-2008, 12:56 AM   #10 (permalink)
What? THIS IS MY GOOD CAR
 
justpassntime's Avatar
 
Join Date: Jun 2008
Location: Eastern Washington
Posts: 285

The Japillac - '87 Honda Accord LXi Sedan
90 day: 31.77 mpg (US)

Ranchero GT - '73 Ford Ranchero GT

Spaz - '83 Chevy S10 4X4 Tahoe
90 day: 27.53 mpg (US)
Thanks: 0
Thanked 0 Times in 0 Posts
Send a message via ICQ to justpassntime
Send me some dirt...

Volones,

Can you send me some Colorado dirt for my car?

__________________
Honda...the economical, renewable resource.


  Reply With Quote
Reply  Post New Thread


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
EcoModding for Beginners: Getting great gas mileage. SVOboy EcoModding Central 55 08-20-2012 11:34 PM
Engine/ECU mod ideas for mileage jcantara EcoModding Central 11 04-30-2010 05:22 PM
In a world where Jeeps get horrible gas mileage.... EcoJeeper Introductions 16 03-26-2009 12:09 PM
mileage is mileage, right? (question about accuracy of small fill) Chris D. General Efficiency Discussion 16 10-21-2008 07:59 PM
Better Gas Mileage from my 06 Matrix thevisionseeker Hypermiling / EcoDriver's Ed 9 06-02-2008 04:11 PM



Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com