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That goes against common sense (why would manufacturers bother building huge wind tunnels), goes against the steady increase in wind tunnel size and complexity as car manufactures have chased better accuracy, and goes against all the published technical literature on automotive wind tunnel design. I don't know of even one peer reviewed SAE paper that covers a full size car in a tiny wind tunnel.
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The big corps have to accommodate big rigs as well as sedans. That a size difference of 2 or 3x right there. They also compete among themselves for photo opportunities.
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As for the figures from the tiny tunnel - who knows? Maybe they juggled compensation factors, maybe they made them up, maybe they're all serendipitously correct?
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Anything is possible. '[S]erendipitously correct' is the coolest correct. 
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Because much of what is in the published literature is nonsense,
and much of what isn’t nonsense is not in the scientific literature.
-- Sabine Hossenfelder
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