FP202 at PA01 checking my speed-keeping tendency

A plane wants to fly a certain speed.
With hands and feet off of the controls my koala wants to fly 53 mph.
At about 58-5900 rpm my plane cruises level at 53 mph.
At about 6000 rpm + it climbs at 53 mph.
At about 5500 rpm it descends about 200'/minute at 53 mph.