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The exhaust leak will cause a loss in mileage, along with the leaking fuel lines. Is it the hard lines or the rubber lines in the valley? Get those fixed and your mileage should improve.
from the looks of it the fuel lines are hard till the tie in at the filter bowl. right there is all dry. where the o rings in the fuel lines from truck to motor. i was told that ford is known for the o rings in the fuel lines to dry up and cause leaking.