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The RPMs will be the same at a given speed assuming you have a manual or have your torque converter locked.
As i understand it the main purpose of lean burn is to allow the engine to pass more air when under lower load conditions. At low load conditions the throttle is almost closed which creates a high vacuum, energy is required to create this vacuum. If more air can pass through the throttle when burning lean it means less energy is used as there is less vacuum.
I am currently looking into burning lean myself, how have you leaned out your closed loop mixture by 20%?
also 12% is a good improvement as far as modifications go.
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