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In piston aircraft this is called Lean Over Peak
They lean out the mixture until they are well past the peak exhaust gas temperature. Running too close and too long to peak EGT will fry the pistons.
I admit I am a total noob to the subject, but I think it would be a good idea to add exhaust gas temperature instrumentation just as an extra engine health safety measure, and another data point to look at, not to mention a way of directly seeing just how lean you are truly running.
Not fair that aircraft get all that wonderful instrumentation, and we don't on modern cars. We claw back some of those gauges with scangauge and the like.
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