I used to do that when I was a kid driving my pickup around the mountains of Vermont and northwestern Massachusetts. Not just "Georgia Overdrive", mind you (i.e., putting it in neutral); no, I was doing what TigerLikesRooster described: shutting off the engine to save fuel (this was during the 70s gas crisis).
That was, until my father found out; he smacked me upside the head for it.
I traveled cross country in 1975. Lived out of my dodge van and carried a Honda 350 strapped to he back on a homemade rack. Parked and camped and took the bike to view the countryside. With a friend and his wife, bike up to the top of the Santa Rita mountains near Tucson. We decided to ‘ race’ down the mountain with engines off in neutral. Got up to over 70 mph. All very quiet except for the wind noise.