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I've been trying to figure this out too. I know about the dust,leaves in the bed not towing. It'll be pretty clean after towing. But if running with a solid tailgate on and closed increases milage , why don't we see taller gates to capture more drag??? On my previous tv,5er, I made a rock guard that went totally across the rear bumper of the tv. It was 4" off the road. On a wet road, the air from the tv swept outwards, in a vortex manner and there was a definite heavier airflow through the v gate. I've had 2x8x14" blocks move from under the 5th wheel hitch to the rear of the truck. As for me, I'll continue to use the v gate. Bill
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