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Mort, Tomato, tomato. still the same thing.
The throttle, the air filter, the intake valve create restrictions to slow down the air. This creates a vacuum.
To maintain a vacuum with a leak requires work over time, which by definition is POWER.
if you can have less vacuum, it requires less work.
I guess one could argue Atkinson increases pumping losses (shoving the air back and forth across the intake valve) to decrease throttle losses, but when done, it is all exactly the same affect.
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