List of aero mods you can do to your vehicle

[Logic]

"Hyundai Motor Company and Kia Corporation have introduced the ‘Active Air Skirt’ (AAS) technology... ...reduced the drag coefficient (Cd) by 0.008, improving drag by 2.8 percent, by installing AAS..."



"...Hyundai Motor and Kia are applying various technologies, such as rear spoilers, active air flaps, wheel air curtains, wheel gap reducers and separation traps, to vehicles to secure competitive drag coefficients..."
https://www.just-auto.com/news/hyund...-aimed-at-evs/

That should make for some interesting research.