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Wow, those graphics answered a question that had been rattling around in my head. Over-simplified, a car is pushing a 'bubble of air' and dragging a 'vacuum'. I wondered if there was a point where the trailing car's 'bubble' would start to fill the 'vacuum' of the leading car. This seems to be the case at around 1 vehicle length +/- .... anything beyond that and the leading car keeps its full aerodynamic drag.
I might have it all wrong in my head, but this is still very interesting information to know!
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