Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - 20% fuel saving with simple roof rack mod

Jimbo · 08-29-2017, 12:24 PM

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.

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