Hi everyone, I have been getting conflicting messages regarding aggressively leaning the mixture while taxiing, or being on the ground in general. My 1968 M20C Ranger POH clearly states to to keep it at full rich and propellor RPM high during taxiing to prevent overheating. Prevent running the engine at low RPM to prevent fouling of the plugs. My mechanic who has been taking care of my Mooney since 2017, says to not lean on the ground and so far reports that my plugs are very clean and are