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While resistance does increase as a square (v**2) of speed, the power, which is what you are measuring, increases as a cube (v**3) of speed. There is also a point at which the air flow across the vehicle becomes "turbulent" after which resistance and power can go off the charts. The aerodynamics...

Air resistance increases exponentially with the increase in speed: an increase in speed will result in a much greater increase in air resistance. In addition, the power required to push a vehicle through the increased air resistance increases even higher. A simple example: a 10% increase in...