I think the mixture thing isn't worked out very well in this game. My real world experiences with changing mixtures are the following and I don't see it represented in CloD:
Lean mixture should give less power but more RPM. It also should run a lot hotter because of various reasons.
Rich mixture should give more power in lower RPM but lacks the ability give as much RPM as with a lean mixture. Rich mixture should also spill some fuel to the exhaust system.
I hope they will take care of it in future updates.
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