Punched up KFOG earlier and they were playing PG's "Solsbury Hill". That's the first pre-1984 song I've heard on the station in 18 months. Of course, after that it was right back to Snooze Babbler etc but still.
I looked at the Mediabase KFOG playlist page to see if there is a trend emerging... not really. I counted 2 or 3 pre-'84 songs on their "oldies" list ("Train in Vain", "Brass in Pocket"). That's 2 or 3 out of several hundred, not counting Petty's "American Girl", played when he died.