Today’s Pontiac Grand Ams apparently have a new feature in their radios: As you speed up, the radio gets louder to compensate for increased road and wind noise. As you slow down, the volume goes back down. Is this common? My rental car kind of freaked me out when it did this unexpectedly, though I do appreciate the feature. I wish my home stereo would compensate by turning the volume up when my wife won’t shut it ;) Just kidding.