If you watch light singles landing at any airport, I bet fewer than one in a hundred make an approach where they could actualy get in if the engine failed on final. Glide approaches are really steep, especially into headwinds. It's completely different to the way we are taught: revs to 1700, half flap, etc. etc. If you're motoring in at all and there's a headwind you won't make it if the engine quits.
QDM