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Something I like to believe, and your post makes a good opportunity to put it out there. I consider the amount of energy it would take to create the amount of turbulence you speak of, like a big fan, how much power would it take to run the fan? This applies to the vortex generation behind a car as well, the amount of power used to "spin" the air is just wasted. The energy required to move the air is an extra load placed on the engine of the vehicle and knocks the heck out of fuel efficiency.
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