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well not exactly a 2 bbl carb, but my '85 Mustang LX 5.0/auto gets around 24 mpg the last (and only time) I checked it. It's CFI.

Mileage will depend on soooo many things. I used to have a '74 Chevy pickup with a nicely built 355 (made ~400 HP) and when gas got above $1.50/gal, I put a factory iron 2 bbl intake and rochester carb back on it. Got worse gas mileage, so I put the Weiand and Holley back on.
 
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