[jeffwass]

Why wouldn’t ICE cars be equally affected by car drag coefficients?

[audunw]

They are, but range is not as big of an issue with ICE, so less pressure to optimize drag coefficient

[londons_explore]

Fuel is cheap. Nobody cares about that extra 0.2 mpg.

For electric it's an amplified effect, because a slightly lower drag coefficient means less energy use per mile, which means you can have a smaller battery, which in turn means lighter, which is again less energy per mile.