Go Back   EcoModder Forum > EcoModding > Success Stories
Register Now
 Register Now

Reply  Post New Thread
Submit Tools LinkBack Thread Tools
Old 08-29-2017, 12:24 PM   #1 (permalink)
Join Date: Aug 2017
Location: Calgary, Alberta, Canada
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
20% fuel saving with simple roof rack mod

Our 2011 Prius fuel use was 5 litres /100km for highway driving at 110 kph. I installed roof racks and fuel use went up to 6 L/100km.

I built a lift-neutral airfoil for each cross bar using western red cedar. The fuel use returned to 5 L/100 km. Wow, I was impressed that a simple mod could make such a huge difference!

I installed a ski box onto the racks without any change in fuel economy. The cross bars seem to be the drag spoilers here.

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

Old 08-29-2017, 05:28 PM   #2 (permalink)
Master EcoModder
Ecky's Avatar
Join Date: Dec 2011
Location: Vermont
Posts: 2,417

Gaptooth - '00 Honda Insight
Team Honda
Gen-1 Insights
90 day: 60.01 mpg (US)

Such Fit - '07 Honda Fit Sport
90 day: 41.27 mpg (US)
Thanks: 798
Thanked 927 Times in 588 Posts
  Reply With Quote
The Following User Says Thank You to Ecky For This Useful Post:
Xist (08-30-2017)
Old 08-30-2017, 09:37 AM   #3 (permalink)
Master EcoModder
Join Date: Jan 2017
Location: Istanbul
Posts: 525
Thanks: 32
Thanked 50 Times in 37 Posts
Ski box did not add any drag?

That is fairly amazing.

But we do need pictures
  Reply With Quote
Old 08-30-2017, 11:54 AM   #4 (permalink)
Xist's Avatar
Join Date: Jun 2012
Location: Mesa, AZ
Posts: 6,188

Chorizo - '00 Honda Civic HX, baby! :D
90 day: 36.05 mpg (US)

Mid-Life Crisis Fighter - '99 Honda Accord LX
90 day: 36.32 mpg (US)
Thanks: 3,633
Thanked 1,070 Times in 806 Posts
You need five posts before you can submit pictures, which we greatly want to see. Just click on these four threads I started, tell me to do push-ups, and you are in business:

Have you ever made a company keep a promise?
Have any of you coached without athletic ability?
Have any of you sold on eBay?
Anyone have experience with hot glue paintless dent removal?

Can someone find a good explanation of tuft testing? I do not see anything on the wiki. Thanks!
  Reply With Quote
Old 08-31-2017, 11:22 PM   #5 (permalink)
EcoModding Apprentice
Join Date: Jun 2010
Location: Australia
Posts: 249

Delivery 'Boy - '86 Suzuki Mighty Boy
90 day: 37.15 mpg (US)

SkipSwift - '13 Suzuki Swift GL
90 day: 35.44 mpg (US)
Thanks: 0
Thanked 52 Times in 41 Posts
This google search will take you to well written wool tuft testing articles


Originally Posted by Crazyrabbit
In God we trust. All others: bring data
  Reply With Quote
The Following 2 Users Say Thank You to BLSTIC For This Useful Post:
Joggernot (09-01-2017), Xist (08-31-2017)
Old 10-30-2017, 05:25 AM   #6 (permalink)
EcoModding Lurker
Join Date: Oct 2017
Location: Prague
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Its kinda no-brainer that majority of racks have many flat surfaces. Considering the fix is easy and looks good as well.

  Reply With Quote
Reply  Post New Thread

Thread Tools

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com