It happens to fly low power, but only in rare occasions. I do that when I cross the mountains and I reduce the power while loosing altitude from ~ 10k to 200 ft

It happens to fly low power, but only in rare occasions. I do that when I cross the mountains and I reduce the power while loosing altitude from ~ 10k to 200 ft at landing. The longest I flew with the engine turned off was ~ 30 miles, that was in a motorglider with the propeller feathered. These cases are so rare, but still exists.