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What about covering the half rear of the bed, and also having a slope down from the cab on the front half?
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My understanding of the half-tonneau is that the air whips around and pushes on the back of the cab. The one would cancel the other.
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You could just drive 2 seconds behind a semi the whole way and get better FE improvement.
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I like a flat bed with a half-height load. Less buffering than a full-height van.