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The wrath of roof rack and roofboxes has been independently tested by Edmonds and Consumer Reports. The impact was 17-25% depending on car, speed type of carrier. I have been developing an idea based on shortened boat tail plates tested on semi trailers, integrated in a cargo carrier for suvs, wagons, hatch backs, and sedans.
Essentially a back mounted aerodynamic cargo carrier. It eliminates the ~20% mpg penalty of roof top carriers and has improved mpg 5-10%, in preliminary tests with the boat tail design. We use it for camping, family road trips, ski equipment etc. AeroPACKusa is the product. I would appreciate your comments. Thanks!
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