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Slide, That's not quite what I meant, I was thinking about how much the car itself displaces which I can kind of work out, I think. 2.4sq m for my car travelling at 100kph (27.8 m/s) 27.8*2.4=66.7 metres cubed/second = 2344.9 cubic feet/second. So 10% is possible, but the cool thing is, that you're REMOVING 10% from in front of the car then adding it behind so actually is it closer to 20%?
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