How big are those slipstream effects compared to speed scaling? Drag power goes as the third power of speed; take average urban speeds from say 30 mph to 300 mp

How big are those slipstream effects compared to speed scaling? Drag power goes as the third power of speed; take average urban speeds from say 30 mph to 300 mph, and the drag goes up a factor of 1,000x -- to on the order of a megawatt.