It may be possible a pickup feels like less wake in passing because it's like 2 wakes separated by 5-8 feet. Where the small SUV has just one wake concentrated behind it. Overall better but a sharp shove vs a long push.
Also on something really long like a semi with trailer, you feel that push from the cab but actually doesn't much of that air settle down and reattach along the trailer? So it's just the 2nd suck back that's the real drag.
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