M model so the airspeed is primary in MPH, correct? Here’s how I teach the pattern in a 172M
Downwind 2200 rpm trimmed hands off for level flight should get you around 100 mph.
Abeam the numbers, carb heat on, 1500 rpm, flaps 10, one swipe up on the trim wheel. 90ish MPH
Base, flaps 20, 80ish...