Good aero is one of the most important part of car design, especially for EVs as range at high speeds is determined solely by energy usage and battery size.
Car and Driver did a great bit of work a few years back with real off the line cars tested ib a wind tunnel back to back.
You can see Mercedes even back in 2014 was on the ball with aero, scroll to the table at the bottom and look at the power needed to sustain 75 and 100mph. In effect due to lazy aero design on the Leaf it uses MORE energy to sustain 75mph than the much larger and more powerful Tesla Model S.
Aero is also why the iPace is so awful when it comes to Motorway range. It doesnt matter what size battery you stick into an EV if the aero is bad the range will be bad. Its really quite astounding in this day and age EV manufactures still aren't pushing aero as the most important design point of any EV.
Drag Queens: Aerodynamics Compared – Comparison Test – Car and Driver
I cannot wait to see what Mercedes can do with their first proper ground up EV, all the evidence shows they know how to do aero, and do it really well. Add in their experience with EV drivetrains from F1, previous collaborations with Tesla, they should deliver a really interesting product.