The Mazda3 I bought new in 2015 has the most aerodynamic rating of any car I've ever owned, at 0.26 coefficient of drag. So I was surprised to feel sidewinds more than those others that I owned through the years. I would have thought that the superior Cd would have allowed it to be more stable, and it seems to be very stable in most situations, but I sometimes do notice those sidewinds for whatever reason. I will say that most of the other cars were heavier, since the Mazda weights in at only 3000 pounds.
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