VXBC9N8 is crap. I had that before my rollback. Mileage was right where your's was. Now I have VXBC4 and my FICM is Bill's strat also with no inductive heating. Difference is night and day. I just filled up my truck and calculated mileage was 17 just driving back and forth to work. Worst I got all winter with warmups, and pulling my firewood trailer was 14.8. It would've been less than 12mpg before. Way more power too.
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2004 F-350 XLT 6.0 Diesel 4X4 04/04 Build
PHP FICM & Rolled Back ECM/TCM 
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