The Cessna 172S Aircraft Flight Manual states the following for securing airplane after commencing a flight:
- Parking Brake -- SET.
- Electrical Equipment, Autopilot (if installed) -- OFF.
- Avionics Master Switch -- OFF.
- Mixture -- IDLE CUTOFF (pulled full out).
- Ignition Switch -- OFF.
- Master Switch -- OFF.
- Control Lock -- INSTALL.
- Fuel Selector Valve -- LEFT or RIGHT to prevent cross feeding.
Why can't you turn off the engine of GA aircraft like a car? Why is mixture pulled out before turning the ignition switch off?