At what point during the break-in phaase is it ok to start leaning the engine aggressively? Is CHT the only consideration? I have about 7 hours on the engine now (plus 2 hours in the test cell) and CHTs have consistenly been mid 350's in cruise since first flight on this engine. Is it ok to start leaning now, if CHTs stay below 380? I've been spending a fortune on Avgas the last week!