The helicopter noise is mentioned in the owner's manual, I believe. My last car (a sedan) did it too. I don't think it's exclusive to SUVs/trucks. I just crack a window slightly and it relieves the pressure build-up.
I never remembered it in my cars but it's been a long time since I've driven a car everyday. First I remember it standing out to me was in an old beater Isuzu truck I owned. Thought it was that truck but my next brand new SUV made the noise too.
The other "noises" of the mkc don't bother me but that noise annoys me. I like to just have the sunroof open without a window cracked (so cold air doesn't blow in).
You would think someone could invent something to stop that in some way with all the engineering :smile
As my wife would say "that's a shark tank idea!" Someone please invent some little device we could put in the car to make that noise stop!
And I tried listening for gas moving in my tank driving home today on a half tank and I can't hear anything at all on mine. After years of working around machines though my hearing is not so great so I don't notice creaks and rattles either thankfully :smile