So, yeah. I have a 2017 and I posted back about a noise, a faint whine, that I thought was the carplay cable (like resistor ignition back in the day over the radio). Its faint but I also noticed again this weekend on a long drive...with radio muted, I could let off accelerator and hear it and it varies with speed. I thought bearing? or now, it makes sense if its a differential with fluid issue. Sadly, I have tinnitus and can't always hear it, or these provided audio clips y'all are posting. Honestly, I just passed 51K miles and considering if Mazda comes out with a Hybrid CX50/CX5, to trade in. Just not fast enough...