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I have had a car with both a single carb. on a dual plane intake and a stock single plane dual car. intake with stock carbs. with progressive linkage. The single four combination drove a lot better than the dual four barrel did until I hooked the dual carbs. up so they both opened together, not progressively I have done that on several other cars wiih good success

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But I bet you can't get 16/17mpg !!

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One thing I learned long ago, ultimately the right foot determines the gas mileage. If you hook both carbs up one to one it will get better mileage, if you drive it like you want good gas mileage, than it will hooked up progressively, especially on a single plane dual quad intake like the the Offy 360 he is using