Technical aspects of automobiles

84 Dodge Colt milage poor after carb rebuild

My brother took out his carb because his car was dying, and had it
professionally rebuilt. The car works great now, but he is getting
25 mpg as opposed to 35+ before.
1) could a broken oxygen sensor effect milage that drastically?
2) Is there any adjustment on the carb or computer that needs
   to be done when the carb is rebuilt?
3) Does the idle mixture effect the overall mixture of a
   carb or only the idle mixture?
4) Any other ideas?

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