Well, this is my method how to lean the mixture:
- Established on the cruise altitude, set the cruise RPM
- Start to lean the mixture monitoring the EGT indicator
- The EGT starts to rise, follow leaning it slowly till it the engine reaches it’s peak EGT
- Once it reaches it’s peak (red line), the engine starts losing the power and runs a bit rough
- By enriching back the mixture only a little bit, the RPMs will increase again slightly and the engine will run smoothly
Advantage? You will get more power from your engine, more RPMs, you will fly faster and will burn less fuel and have more endurance. Thus the overall efficiency will increase :-).
You can see the same process in this 47 seconds short video in a Piper PA28.
Safe landings! 🙂
leaning the mixture using egt indicator
Fly with Stan - Sharing (not only my) flying experiences... 
I can feel your pain! This is all about Exquisite Gin Tonic (EGT) mixing right? And the RPM is referring to Remarks Per Minute coming from the beloved one, eg. your wife. Yup, definitely, by enriching the mixture the EGT rises and so does the RPM. Watch out when the engine loses power, your running will be kind of rough …
🤣🤣🤣🤣🤣 Yes! Exactly that one: Exquisite Gin Tonic 🤣🤣🤣🤣🤣 With the correct mixture you forget the wife… 🤣🤣🤣🤣🤣