Quote:
I haven't done any serious A-B-A testing of course, but my limited experience (a few days of driving compared to a almost a year of eco-driving before that), and my theoretical in-my-head analysis, suggests that this won't add any drag to the vehicle.
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If you compare the amount of air entrained by the vehicles passage, with the air exchanged through the openings, there will be an
orders of magnitude difference.
Cf:
https://en.wikipedia.org/wiki/Meredith_effect