I've got a very similar setup as you but with the Edge tuner and straight piped factory exhaust. Right now I'm averaging 14.5 MPG
. Have you reprogrammed for the right tire size?
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My Truck: '03 F250 CC SWB Lariat, 7.3, auto, aFe 4" straight piped, DIY Tymar intake, GTP38R on a blank pedestal, TS 6-position with canned tunes, AIH delete, boost fooler, CCV mod, Iron Cross wheel-to-wheel HD Steps
Farm Truck: '93 Ram D350 Club Cab, Cummins, G360, pump tweaks, 366 spring, DennyT Stage II pin, BHAF, Diamond Eye 4", SDX 5x.012s