According to the 2017 Infinite Dial Study, 82% of the U.S. population listens to AM/FM radio every month in their vehicles. CDs are next at 52%, digital music is at 45%, and online radio, which includes streaming services such as Pandora and Spotify, lags way behind at 26%.
Radio Ink
March 9, 2017
http://radioink.com/2017/03/09/radio-still-dominates-car/