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One of the easiest ways to improve the Cd of a vehicle is to make it bigger, which natch increases total drag...and I think that's why the manufacturers of big sedans big SUVs etc tout their Cd rather than their CdA. As I recall, there's an example in Hucho showing how bulging a flat roof up reduces the Cd, but no more than the frontal area increases, leaving CdA unchanged.
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