Go Back   EcoModder Forum > EcoModding > Aerodynamics
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 11-28-2007, 09:58 PM   This thread is in the EcoModder Project Library | #1 (permalink)
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 19,649

Blackfly - '98 Geo Metro
Team Metro
90 day: 70.72 mpg (US)

ForkenSwift - '92 Geo Metro EV
Last 3: 95.68 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 47.99 mpg (US)
Thanks: 2,136
Thanked 4,891 Times in 2,458 Posts
How to improve fuel economy with a tonneau cover

Via autobloggreen.com ...

How to improve fuel economy with a tonneau cover

Quote:
Snugtop, a company that makes tonneau covers and bedcaps for pickups, [...] conducted a very intensive test this month at Irwindale Raceway in Southern California. Using fullsize pickups from Dodge, Ford and Chevy, the trucks were driven 100 laps at 45 mph. Two had tonneau covers and the third had a bedcap. The gas tanks were topped off and the tonneaus and bedcap removed for another 100 laps at 45 mph. Bottom line: Snugtop reports a 1.3 mpg improvement and says even better mileage can be expected at higher speeds.
Full details of their methodology is available, which is nice. (Have to go to the manufacturer's site to read it.)

__________________
Latest mods test: 15 mods = 15% MPG improvement: A-B test, 2007 Honda Civic 1.8L, 5-speed
Ecodriving test:
Manual vs. automatic transmission MPG showdown: Nissan Micra 1.6L



EcoModder
has launched a forum for the efficient new Mitsubishi Mirage
www.MetroMPG.com - fuel efficiency info for Geo Metro owners
www.ForkenSwift.com - electric car conversion on a beer budget
  Reply With Quote
The Following User Says Thank You to MetroMPG For This Useful Post:
slowmover (11-02-2011)
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 06-03-2008, 06:55 PM   #2 (permalink)
Master EcoModder
 
aerohead's Avatar
 
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 8,367
Thanks: 10,260
Thanked 4,399 Times in 2,441 Posts
snug top

Quote:
Originally Posted by MetroMPG View Post
Via autobloggreen.com ...

How to improve fuel economy with a tonneau cover

Full details of their methodology is available, which is nice. (Have to go to the manufacturer's site to read it.)
Darin,hope they didn't go broke buying and burning all that fuel.It's a great thing for them to have done all the testing.And 1.3 mpg at 45-mph really does speak for even better mpg at higher speeds.I've done your famous self-administered head-slap for just getting around to looking at this post at such a late date. Its a significant contribution,should really help the pickup owners, glad I got to see it,thanks much for posting it.
__________________
Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
  Reply With Quote
Old 06-03-2008, 10:19 PM   #3 (permalink)
Boxhead
 
whokilledthejams's Avatar
 
Join Date: May 2008
Location: Fredonia, NY
Posts: 322

Boxy Brown - '04 Scion xB
90 day: 35.48 mpg (US)
Thanks: 0
Thanked 1 Time in 1 Post
Send a message via AIM to whokilledthejams
In college, I had a 1995 GMC Sonoma (S10 clone), with a regular cab and short bed (4cyl, 5 speed, 2wd-- totally stripped-down model). I had a tonneau cover the whole time I owned it, and I definitely got several mpg less at highway speeds when I didn't have it on (not that often, but I definitely could tell). With the cover on, and normal driving, I got around 30mpg at 75mph. My all time high was 32mpg, without really trying, and before I ever heard of hypermiling.


But yeah, to keep on topic, keeping the tailgate up is better than down, and a tonneau cover is better still. It's not as good as fashioning a cap into a pseudo-kammback, but every little bit helps.
__________________
  Reply With Quote
Old 07-10-2009, 10:05 PM   #4 (permalink)
Boxhead
 
whokilledthejams's Avatar
 
Join Date: May 2008
Location: Fredonia, NY
Posts: 322

Boxy Brown - '04 Scion xB
90 day: 35.48 mpg (US)
Thanks: 0
Thanked 1 Time in 1 Post
Send a message via AIM to whokilledthejams
Quote:
Originally Posted by zacksewer View Post
Most of the time, I noticed more and more people in pickup trucks driving around with the tailgate down. Without an easy way to measure it, does this stay just a theory?
Actually, this is one of the few things that was done right on Mythbusters (since there were no explosions involved). Tailgate up is, without doubt, better than tailgate down. With the tailgate up, a vortex forms over the bed that sort of acts like a kammback (though not as effective, being normal-pressure air currents). That current does not form with the gate down; driving like that makes your wake bigger and more turbulent.

Yes, it's counterintuitive.
__________________
  Reply With Quote
Old 07-11-2009, 09:55 AM   #5 (permalink)
Administrator
 
Daox's Avatar
 
Join Date: Dec 2007
Location: Germantown, WI
Posts: 10,292

CM400E - '81 Honda CM400E
90 day: 39.62 mpg (US)

Daox's Grey Prius - '04 Toyota Prius
Team Toyota
90 day: 49.53 mpg (US)

Daox's 04 Civic - '04 Honda Civic DX
90 day: 44.54 mpg (US)

Daox's Insight - '00 Honda Insight
90 day: 64.33 mpg (US)
Thanks: 1,812
Thanked 2,000 Times in 1,225 Posts
The SAE also has a published paper that proves tailgate up is better.
__________________
Current project: Heating the manual trans with engine coolant
  Reply With Quote
Old 07-12-2009, 01:13 AM   #6 (permalink)
Master EcoModder
 
Big Dave's Avatar
 
Join Date: Jan 2008
Location: Steppes of Central Indiana
Posts: 1,276

The Red Baron - '00 Ford F-350 XLT
90 day: 27.99 mpg (US)

Impala Phase Zero - '96 Chevrolet Impala SS
90 day: 21.03 mpg (US)
Thanks: 0
Thanked 154 Times in 109 Posts
Wow!

They found out what I found out eight years ago. In a 70/60/city circuit I got a 1.5 MPG improvement.

Anybody wanna buy a nice ARE tonneau?
__________________
2000 Ford F-350 SC 4x2 6 Speed Manual
4" Slam
3.08:1 gears and Gear Vendor Overdrive
Rubber Conveyor Belt Air Dam
  Reply With Quote
Old 06-30-2010, 12:21 AM   #7 (permalink)
EcoModding Lurker
 
Join Date: Jun 2010
Location: Minneapolis
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Nice MetroMPG. I learned a lot of information with this thread. I hope that I can improve fuel economy with a tonneau cover.
  Reply With Quote
Old 06-30-2010, 10:55 PM   #8 (permalink)
Master EcoModder
 
Big Dave's Avatar
 
Join Date: Jan 2008
Location: Steppes of Central Indiana
Posts: 1,276

The Red Baron - '00 Ford F-350 XLT
90 day: 27.99 mpg (US)

Impala Phase Zero - '96 Chevrolet Impala SS
90 day: 21.03 mpg (US)
Thanks: 0
Thanked 154 Times in 109 Posts
If a tonneau does not help your pickup,you're doing something wrong.
__________________
2000 Ford F-350 SC 4x2 6 Speed Manual
4" Slam
3.08:1 gears and Gear Vendor Overdrive
Rubber Conveyor Belt Air Dam
  Reply With Quote
Old 10-30-2011, 02:14 AM   #9 (permalink)
EcoModding Apprentice
 
Join Date: Mar 2010
Location: Los Angeles
Posts: 110
Thanks: 0
Thanked 5 Times in 5 Posts
what if you were to place a piece of sheet metal from the middle of the bed,to the top of the tailgate? The low side would be at the bed and the high part would be at the tailgate.
  Reply With Quote
Old 10-31-2011, 06:46 PM   #10 (permalink)
Aero Wannabe
 
COcyclist's Avatar
 
Join Date: Dec 2007
Location: NW Colo
Posts: 530

TDi - '04 VW Golf
TEAM VW AUDI Group
90 day: 60.98 mpg (US)
Thanks: 330
Thanked 102 Times in 83 Posts
Quote:
Originally Posted by sc2dave View Post
what if you were to place a piece of sheet metal from the middle of the bed,to the top of the tailgate? The low side would be at the bed and the high part would be at the tailgate.
If you are thinking about it sloping up like a big spoiler it probably won't help mpg. Although, I believe Chevrolet did some testing and found a half tonneau covering the back of the bed was better than a full tonneau for reducing drag. It would have been level with the top of the bed though.

__________________
60 mpg hwy highest, 55+mpg lifetime
TDi=fast frugal fun
make NOx not Carbon

  Reply With Quote
Reply  Post New Thread


Tags
tonneau cover

Thread Tools




Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com