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The percentage gain was derived from data gained while road testing the device on my F150 and from having one installed on Dr. Anamaat's Chevy pickup. The front air dam is there, as you know to reduce turbulence under the vehicle so it does not directly interact with the rear window spoiler. The rear window spoiler works best in conjunction with a tonneau cover.
The aerocap produced a greater fuel economy increase mainly due to it's greater scale. I am unfamiliar with the perforated panel you speak of and I will have to research that.
Bondo
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