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Old 08-29-2017, 12:24 PM   #1 (permalink)
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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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Gaptooth - '00 Honda Insight
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Gen-1 Insights
90 day: 70.92 mpg (US)

Such Fit - '07 Honda Fit Sport
90 day: 41.27 mpg (US)

Velomobile - '13 Sun Seeker EZ-TAD SX
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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)
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Chorizo - '00 Honda Civic HX, baby! :D
90 day: 34.82 mpg (US)

Mid-Life Crisis Fighter - '99 Honda Accord LX
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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:


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)
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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


Originally Posted by Crazyrabbit
In God we trust. All others: bring data
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Old 10-30-2017, 05:25 AM   #6 (permalink)
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Its kinda no-brainer that majority of racks have many flat surfaces. Considering the fix is easy and looks good as well.

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