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The Coefficient of drag is based only on the frontal area of the vehicle with a constant to account for the type of vehicle, bike, car, truck etc. This a straight forward mathematical calulation. It does not include anything else like under trays, smooth shape or the rear end
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Can't agree with you mate,
The drag coefficient is total drag divided by the area of the vehicle, air density and some degree of velocity.
The total drag is an experimentally measured value and it does depend on the vehicle shape, amount of turbulence caused etc etc.
Just
for "drag coefficient", the very first link that comes has the formula:
http://www.grc.nasa.gov/WWW/K-12/airplane/dragco.html