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Old 10-03-2022, 04:38 PM   #12 (permalink)
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The Prius Experiment - '07 Toyota Prius Base
90 day: 58.52 mpg (US)
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Engines don't need exhaust backpressure. What they actually need is flow velocity, for exhaust scavenging. Closing off part of the exhaust during cylinder deactivation should help maintain flow velocity.
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