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The four barrel usually gets a little better mileage because the primaries of a Rochester Quadrajet are a lot smaller than the Rochester 2-jet that was used at the time.

Once you open the secondaries of a quadrajet however, you will use significantly more fuel than a 2-jet.

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Q: What is the gas mileage on a 350 motor with a four barrel carb compared to a 350 with a two barrel carb?
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