Quote:
Originally Posted by steeve
Finally, I did do another test recently to determine if there would be any savings by lowering the tailgate over about a 180 mile distance (90 miles in each direction during a visit to my daughter). My friend said there wouldn't be any difference. I was surprised to find that mileage got a bit worse by about 1-2 mpg. I suppose it could have come down to using a different diesel fuel brand than usual or a difference in wind direction/speed, so more testing on that would probably be advisable.
Cheers
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Counter-intuitive as it may seem, keeping the tailgate up reduces air resistance.
The cab creates a turbulent wake and the tailgate more or less confines it. So tailgate down does not help.
Since you're interested in truck aero there's a couple of links you may find useful (a repost from this thread):
http://ecomodder.com/forum/showthrea...s10-35043.html
http://ecomodder.com/forum/showthrea...1-a-19525.html
http://ecomodder.com/forum/showthrea...tml#post373765
The thing that struck me in the last graph is how well the cab wing and tonneau cover perform when combined.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gmeter or 0.13 Mmile.
For confirmation go to people just like you.
For education go to people unlike yourself.
Last edited by RedDevil; 01-10-2019 at 04:01 AM..
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