Ok, ok. I'm being hammered on being way off on air/fuel ratio! I was drawing from memory something I read in my private pilot ground school textbooks in high school 30 years ago! Please forgive my faulty memory if it was that. Maybe back then that was the optimum air/fuel ratio for air-cooled engines or for all engines prior to computerized fuel injection systems that can directly measure the oxygen content of the intake air (something I just read in Wikipedia). <pant, pant> Whew! That was a mouthful for a single sentence from me!
Sorry to cut and run, but I've got a contract flight to do this early morning...