I am refering to single engine propeller aircrafts.
Intruder. I think you were meant "What you apparently misunderstand is that max range IS at L/D max" instead of "What you apparently misunderstand is that max endurance IS at L/D max".
The problem is that the Flight Test Notes p.78 says Best Glide is at the best L/D ratio (lowest point on the drag vs speed curve). And then max endurance is at a lower airspeed and higher drag point along the same drag vs speed curve. This I find doesn't quite make much sense.