Correct me if I'm wrong, but the hottest combustion temperatures will result when the air/fuel ratio is ideal, or stoichiometric, no? I ask, because there seems to be this mentality that a lean mixture will result in even hotter temperatures, and could cause engine damage. This has not been my experience. In aviation, Cessna recommends leaning the mixture until peak exhaust gas temperature is reached. Further leaning only reduced the EGT reading, it does not increase it. What is the truth?