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Found this blip as well. "Since humid air carries less oxygen per unit volume, either the driver or the ECU will open the throttle more to achieve the desired power. Larger throttle openings reduce pumping losses. Also, the effective compression ratio increases due to the large air mass entering the cylinder.
Humid air quenches (cools) combustion permitting optimised ignition advance, creating more torque from the same amount of fuel."
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