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Re the SUV - Aptera convoy.
In this case It's just about pressure drag. You got high pressure up front and low pressure behind, the differential causes the drag. The hummer will fill the Aptera's low pressure wake an reduce the pressure differential. The Aptera "gives" some of it's low back pressure to the SUV reducing again its pressure differential.
Two vehicles traveling together have less drag than the sum of their individual drag. That is one of the basic "laws" of pressure drag.
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