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Check out patent # 6959958 by Tourigjm's Professor Visser. He combines the use to vector generators and enclosed and open panels mounted to the rear doors of the trailer to obtain a significant reduction in drag. When multiple panels are used, they appear to taper inward at a 20degree angle from the rear of the trailer. The "dirtier" the front of the tractor/trailer combo, the bigger the reduction in drag. You should be able to find it Patent Storm.com. You will have to register but the process is fast and free.
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