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Why wouldn't a turbo, if properly set up, increase efficiency? Follow the air/exhaust flow: energy is used to suck air into the engine. In the cylinder it's compressed, ignited, and comes out the exhaust port hot and under some pressure. The turbo takes some of the otherwise wasted energy in the hot exhaust, and uses it to push the intake air into the engine, which means no pumping loss. That'd seem to equate to a more efficient engine, wouldn't it?
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