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That chart is if you hold the airflow constant and change the fuel. However at constant power and speed, leaner requires a bigger throttle opening like Ecky said, and you'll get gains well past 16:1. Honda's lean burn engines ran 22:1 despite poor combustion, because it's more efficient to pump a lot of extra air and not have the gasoline burn completely than to restrict the engine and run stoichiometric with low MAP.
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