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' 21-mpg'
That seems very reasonable, considering the bedcover.
It resembles member 'bondo' ( Brett Herndon)'s patented Aerolid aeroshell, which, for the 2012, Ford F-150, measured a delta- Cd 0.067 drag reduction in the wind tunnel.
Member 'AeroStealth' had both the Aerolid and Aerotail ( boat-tail ) on his 2014 F-150 EcoBoost, 4X4, 6'-bed pickup, giving Cd 0.31.
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Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
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