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I purchased a Spartan Phalanx, DPF/DOC delete pipe, and S&B airbox recently. I have to admit the power it provides is truly awesome. But that was not what I purchased it for. I wanted to gain mileage. I have heard many stories about how a tuner, pipe, and CAI helped the mileage on the 6.4 greatly, so I went for it. Now I have a 2009 CC 4x4 dually with 4.10 gears. Before I bought the tuner, I was showing 11.3 on the lie-o-meter, and was getting about 12 hand calc'ed. Now the lie-o-meter is showing 18.8, which I thought was great! But alas, I have only gained about 1 to 1.5 mpg in reality.
Have others seen this situation also? By the way, I am running the 250 tune, which I heard was the best for mileage. Any help out there? would like to get the 4-6mpg gain that I've heard others talk about.
09 F350 CC DRW 4X4, 4.10, Lariat Ultimate, wide track front end