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healthy diffuser!
I like that term! Also need a healthy airdam. But i get what you're saying, in near perfect conditions, clean airflow, even pressures and velocities the air behaves like the boat tail was there. COOL. my truck is a long way from here but very interesting.
Freebeard, i threw the porous material thing in there cause i had heard that a porous material on the rear end of semi trailer helped with mpg... read it somewhere, think it was NASA, but could be wrong. I pictured the 'sponge' slowing and damping the eddies in the draft. Will see if i can find a reference.
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