Fascinating, thanks for the insight.These claims have floated around for years and been resoundingly proven false in real world test.
https://www.consumerreports.org/cro/news/2013/08/pickup-truck-tailgates-and-fuel-economy/index.htm#:~:text=We found that adding a,decreased efficiency to 21.5 mpg.
Just to add to what I'm saying, if there was some configuration that improved mileage, truck makers would preconfigure the trucks to work that way. With CAFE standards what they are, they want every ounce of fuel efficiency they can get. Truck beds are designed to create an air vortex when the tailgate is up that maximizes fuel efficiency. Disrupting that vortex by putting on a cover or dropping the tailgate will change the aerodynamics the truck was designed to have, and lower efficiency.
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