The Hyundai Ioniq 9 may look like a futuristic living room on wheels, but even with its boxy shape, it’s impressively aerodynamic. The 0.259 Cd is one of the best in the segment, although still behind the Lucid Gravity (0.24). Beyond the usual tricks to lower the drag coefficient like the side cameras, aero wheels, and underbody cover, the engineers also made the roof smoother. How? By getting rid of the conventional top-mounted antenna module.
