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It doesn't. An intercooler cools and densifies the air entering the engine after being compressed (and therefore heated) by a supercharger or turbocharger. Because the air entering the engine is denser (more molecules), it needs MORE gas in order to maintain the correct air-to-fuel ratio. An intercooler is intended to increase horsepower, which means increased gas consumption... not decreased.

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Q: How much does an intercooler increase gas mileage?
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