Originally Posted by
Carbonfiberboy
Which I believe means that power goes up by the cube of velocity. Correct?
Aerodynamic drag and power, yes. So the bike at 30 MPH, where aerodynamic drag is say 85% of the total, power is to very close to the cube of the (air) speed, But a car is so much heavier and has so much more internal resistance, aerodynamic drag is a far less percentage of the total and hence the increase from 30 to 31 MPH is going to be closer to linear for drag and quadratic for power. (60 to 61 MPH starts looking more like the bike's cube of velocity.)
Ben