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Stand in front of your car and look at how aerodynamic it is, and note the frontal area. Now step to the side so you're looking at it from a 20° angle, like a crosswind does. Its frontal area is much larger, and chances are the side of your roof is now a large part of the trailing end of your car.
Don't judge a car solely by its CdA with 0° yaw, look also at its crosswind sensitivity. Rounded sides are nice to have, as is a short overall length.
As an exercise, picture a tractor trailer, bus, or Club Cab longbed pickup in a crosswind. Longer vehicles suffer the worst in crosswinds.
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