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I hear you about needing your truck bed. There is some research showing that a 2/3rds tonneau (open directly behind the cab) really helps aero on pick-ups. Could you fab up a folding one that you could stow when not hauling hay? I would skip the aerotabs unless you have some reliable way to test A-B-A to make sure they are not hurting more than helping.
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60 mpg hwy highest, 50+mpg lifetime
TDi=fast frugal fun 
https://ecomodder.com/forum/showthre...tml#post621801
Quote:
Originally Posted by freebeard
The power needed to push an object through a fluid increases as the cube of the velocity. Mechanical friction increases as the square, so increasing speed requires progressively more power.
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