I have a 2011 Superduty DRW, 3.73 gear, stock tires, S&B intake. I just installed KEM tunes with the H&S Black Maxx. DPF is still on. I took a trip up to Charlotte on I-85 North almost 140 miles. I got 22.1mpg!!! My previous best stock was 18mpg and I had the mirrors folded in with a tail wind. Today the mirrors were out, no wind and I got 22.1! Very happy so far. This is on the first tank so hopefully it keeps it up. Also I was running KEM's fuel saver tune.
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