"The POH for the aircraft, and the Piper method of leaning (a PA28) for best economy was to push the throttle to max (firewall) and set the RPM using the mixture. This sounds a litttle crazy, but the proof was there! The economy was great."
Were there any other requirements/details for this method?
Can anyone explain the theory for an ignorant PPL such as me?
(I've used the EGT and "rough and back off" methods.)