Difference between Cd and Cda?

[SteveX82]

CdA actually considers more factors, as it is Cd (drag coefficient) multiplied by A (the frontal area of the object in question). The value you found has to be Cd...it's far too small to be the CdA value of a vehicle that size unless it has a Cd value of <0.15 (which it doesn't )

For example: Car A has great aerodynamics (Cd=0.25), but a very tall roofline and, consequentially, a large frontal area of 3.0m^2. Car B is less slippery (Cd=0.35), but is smaller overall and has a frontal area of only 2.0m^2. At any speed, Car B will cause less aerodynamic drag and waste less energy overcoming it.

Just in case you're interested, the formula for aerodynamic drag is:

1/2 * rho * velocity^2 * Cd * A where rho is air density (which changes with temperature, altitude, etc)