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If you get more air mass in the cylinder with a lower percentage of fuel then you can get the same power with less fuel.
Opening the throttle provides more air, which raises the actual compression pressure in the combustion chamber prior to ignition of the fuel air mix. Since IC engines use the "leverage" of the difference between compression pressure and combustion pressure to accomplish useful work you can get the same amount of power at the same RPM with lean burn while using less fuel and more air.
It will only work under light loads, when normal manifold vacuum would be fairly high, compared to higher loads that would require more power.
regards
Mech
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