Aerodynamics, does that in many cars when you roll down the rear window of any vehicle. You've never noticed that in other vehicles before?subdjoe wrote: ↑Sat Mar 27, 2021 12:31 pmWe just picked up our 2021 Leaf Thursday evening. We were just out for a drive, had the e-Pedal engaged. Put down the passenger-side rear window and was hearing a thutter, about like a Huey UH-1 that we didn't hear with the window up. It started at about 20 mph and got louder and faster as we went to 45 mph. Is this just breaking it in? Or is it an item of concern?