Online!
The studies, taken in 2021 and 2023, appear to show some two-thirds of people surveyed prefer AM/FM in their "connected" cars to streaming services or playing audio off their phones.
There's a lot more to this study but there is a caveat - it was done by radio giant (and recent bankruptcy filer) Audacy, which of course has a vested interest in radio coming out on top.
But for what it's worth, you can read a brief summary of the results here.