Truck aerodynamics might as well be alien technology considering how difficult it is to use basic logic to determine if something hurts are helps aerodynamics.
Remember when EVERYDOY was putting mesh tailgates on their trucks because it supposedly helped fuel economy?
(never mind that it left the un-braced the bed sides as strong as partially wet cardboard).
Then expensive tonneau(sp?) covers became popular for similar reasons.
Heck.. back in the pre-internet days, people even thought these helped aerodynamics.
The stick pushing a turd shape causes all kinds of turbulence and vortexes- and I think the designers actually design the trucks to allow for all kinds of shapes behind the cab (loaded and unloaded).
Ok, to the real topic.
So does running two big flags like this significantly hurt real world highway fuel economy, or is it a wash?
And maybe if it's a wash, maybe we could rig up some type of deploy-able canvas chute on poles off the bed sides to use as an air brake (saw another post bad rear end crash today.. involving old pickup that couldn't stop in time for unexpectedly stopped traffic on highway).