Excursion exhaust manifold stud replacement = better MPG?

So. After a on going 3 weeks I replaced the exhaust manifold studs on my V10 excursion. It was fun. Any way seems to have improved my mpg a little. Maybe? Just my imagination? I get my O2 sensor could have been reading low. Dumping more fuel. But the little bit I have used it, seems the gauge slowed down. Or it's broken now..
Any one else experience similar results?

Go to the ford truck enthusiast forum. You'll get all the answers there


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Believe it or not, an exhaust leak can affect exhaust scavenging and the O2 sensor. Not uncommon to have a leak affect fuel air mixture, making the ECM think it has a lean condition.