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This fuel air seperator a long with the high pressure fuel system has been the best thing i've done. Last summer I went on an Excursion with 5 of us and all our gear for a 5 day outing. From sea level to 4200ft and pulled 24mpg and I checked it out after wards with a reading of 18mpg in town. This is done with a TS hard chip on the 140hp setting. I also had my manuel torque converter lock on all the time. The engine is smooth and quiet. I have other powerstroke owners ask all the time why mine is so quiet.
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