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I've never seen anyone get a professional tune like this, but since all new cars are throttle by wire, what you could do is have 18:1 AFR say above 1500rpm and below 50% load, increase the throttle opening accordingly, and then make it jump straight to stoichiometric above 50% load and at idle and such. That way you never accidentally run 15-16 AFRs and damage things. It would be difficult to get the lean to stoich transition smooth but it would be worth the fuel economy benefit I think, especially on a large motor like that.
With my primitive cable throttle if I were to get a standalone and try to tune it, I would have to have it transition back to stoichiometric at a lower load to avoid accidentally destroying the engine.
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