Better mpg with windows up and many newer cars make a like booming sound when rear windows are opened.
My 2003 Astro van don’t make booming noise like our cars do but a loud hissing sound when the rear slider’s are open and very loud woosh when the flip open sliding door window is open.
The two front windows are fine but I used to have the windows open a lot more when I had wing windows in my vans and cars,
The last car I had that had wing windows was an early 80s Ford country Squire station wagon And the last vans with wing windows were a 1993 and 94 chevy g20 conversion van fraternal twins the wife and I had.
Hers was gray with blue trim and mine was blue with gray trim, we kept them until around 2008 before I got the Astro,
Man I miss loading the family up coming back from swimming/water parks in summer with windows open on them things, our hair/bodies would be completely dry in minutes,
I was thinking of looking for a mint low mileage conversion van but the nearby theme parks and waterparks like the vans are gone and 2 of our 3 are married and gone and who knows how long before we will be empty-nesters so no need for a big family truckster