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I assume he had some cargo on the rack, and it wasn't empty?
I see that as reducing drag, even if no thought of aero was put into it. Even a partial fill of that low pressure zone should be a benefit.
This is why I'm putting on a custom lightweight hitch carrier I made for my Prius. I do want to put on a coroplast bottom and some low sides, but that is about it.
Have you ever seen a car on the highway with a temporary paper license plate? It's always blowing upward. That always gets me thinking.
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