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On my old Astro van the rear bumper scooped a ton of air on the lower edge. So you might try making a belly pan across the rear of the van to prevent this from happening on yours. I always thought that I could have gotten 1 or 2 more mpg from one. But an Astro is different than one of these Ford creeper vans, as Astro's are more like a car than a truck.
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