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A little off topic but 'carburetor' related.....
My 66 mustang 6 cylinder 1bble ran lean on the highway because I had instlled headers on the straight six. (3-2-1) ran 1 3/4" pipe into a muffler that then dualed uot to gt tips.
I got 27-28mpg all day long at 60-65.
I never adjust the the factory carb except to set idle.
I 'believe' that over exhausting helped create less pressure that lead to lean burn that lead to great mpg.
I realize you don't have time to rework the exhaust.
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