For the past 19 years I am the single owner/flyer of a 1963 Piper Cherokee 180, with a Lycoming O-360-A3A. TTSN on the engine is 2699, 241 since SMOH, and 20 hours since annual and oil change. I lean aggressively during taxi, and use my JPI EDM930 to lean to peak EGT while I cruise at 2400-2450...