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And if you put a flat plate (like a throttle plate) right into a given airflow, that itself introduces an element of aerodynamic drag. Minimize that drag (like placing that flat plate parallel with the airflow instead of facing the airflow), and you increase efficiency.
That's in addition to, and separate from, the idea that engine efficiency will be improved from lowering the vacuum inside the intake manifold in order to minimize pumping losses.
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