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Do you wanna post some tables from your ECU? My hunch is because you have double VANOS, the engine probably has considerable internal EGR, which limits your ideal lean-ness. Maximum efficiency would come from retarding the intake cam quite a bit, and running as lean as possible.
A small amount of residual exhaust gas can help bring temperatures up and help ignition, but the more EGR there is, the smaller the temperature change and the slower the mixture burns. Whatever is left in the cylinder when the exhaust valve closes is probably all you want.
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