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Don't they want some downforce at Bonneville? Or at least, no or minimal downforce BUT no opportunities for airflow to get under the vehicle at speed potentially causing lift or instability? That isn't a problem on the street unless your name is Hermie.
We have seen that there is a sweet spot for the ground clearance re: lowest drag; too low and too high lead to more drag. I don't know why the air dam clearance would be any different. My guess is too low adds unwanted frontal area... FWIW.
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