While I practice idle power landings every few months, I have a reservation about my odds of success if I have to do it for real. It is my understanding that the drag of a stopped prop is materially less than the drag of one at idle power. My concern is that where I fly most frequently (NY/Philly corridor) means that if my engine fails I am likely going to be trying to squeeze an off-airport landing into a small space. If the plane, in a real engine out situation with the prop stopped, glides much better than it does during my practice, will I be likely to land longer than I want...maybe over running what was a land able field.
I recognize that I can try engine out practice at altitude with the prop stopped. But my concerns about a landing emergency haven't yet been strong enough to get me to pull the mixture and stop the prop in the air.