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Old 08-29-2017, 12:24 PM   #1 (permalink)
Jimbo
 
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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.

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Old 08-29-2017, 05:28 PM   #2 (permalink)
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Join Date: Dec 2011
Location: Vermont
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Gaptooth - '00 Honda Insight
Team Honda
Gen-1 Insights
90 day: 69.77 mpg (US)

Work Van - '16 Chevy Express 2500
90 day: 17.37 mpg (US)
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Pics?
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Old 08-30-2017, 09:37 AM   #3 (permalink)
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Ski box did not add any drag?

That is fairly amazing.

But we do need pictures
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Old 08-30-2017, 11:54 AM   #4 (permalink)
Ecomuggler
 
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Location: Mesa, AZ
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Chorizo - '00 Honda Civic HX, baby! :D
90 day: 44.23 mpg (US)

Mid-Life Crisis Fighter - '99 Honda Accord LX
90 day: 36.36 mpg (US)
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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!
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Old 08-31-2017, 11:22 PM   #5 (permalink)
EcoModding Apprentice
 
Join Date: Jun 2010
Location: Australia
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Delivery 'Boy - '86 Suzuki Mighty Boy
90 day: 37.15 mpg (US)

SkipSwift - '13 Suzuki Swift GL
90 day: 35.44 mpg (US)
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This google search will take you to well written wool tuft testing articles

https://www.google.com.au/search?q=a...HIXp8wfrvJCwCA

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