Question for anyone....I IS IT OK OR ARE YOU SUPPOSE TO LEAN THE MIXTURE OUT WHEN ON THE GROUND? In most of my flight training it has been mixed with most saying you should go lean on the ground. At Riddle is was in the checklist to lean the mixture before taxiing. I've had a couple of Examiners tell me it's bad for the engine to do that. Most of the people telling me not to are people that have a great deal of experience. Just wanted to see what the thoughts are out there