Actually average CdA (drag area) would certainly have gone up in most parts of the world due to SUVs becoming popular. Looking at values on Wikipedia [1] defin

Actually average CdA (drag area) would certainly have gone up in most parts of the world due to SUVs becoming popular. Looking at values on Wikipedia [1] definitely does not show an obvious reduction over the the last 20 years. [1] https://en.m.wikipedia.org/wiki/Automobile_drag_coefficient https://en.m.wikipedia.org/wiki/Automobile_drag_coefficient