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These mileage gains are certainly possible with my car, but the exhaust itself would only be the proximate cause of the increase. Essentially, by adding power, the car would be able to cruise at a given speed under a lower load percentage. By reprogramming the ECU to take advantage of that particular load/rpm range, additional mileage could be achieved.
I don't know if any of that increased mileage could be realized without actually retuning the car to take advantage of the new exhaust. Also, many other factors may come into play, such as naturally aspirated versus turbocharged engines.
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