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an FPR would only affect fuel consumption if it were stuck open. it's possible, but pretty rare. you should see it at the tailpipe if that were the case. with unleaded fuel, your tailpipe should not be sooty. if it is, you are running rich.
a vacuum leak could cause a loss in fuel economy. perhaps one of your new lines is not seated, or you forgot one.
definitely run a tank and track the miles, then do it again.
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