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You should consider yourself lucky if you get 12.5 mpg with that size of lift & tires. I only got 12 mpg hwy with my truck stock height and tires. S&B, dpf delete, and Spartan 250 got me up around 18 mpg hwy stock height and tires. 4" lift with 35" tires brought me back down around 15-16 mpg hwy. Only way to improve mileage is to get rid of dpf. To do that you will need a programmer.
08 F-350 Harley Davidson Edition
Spartan dashdaq, 310 KEM, S&B Intake, AFE 4" downpipe back w/ dpf delete, DD Cold side pipe, Dieselsite boots, 4" BDS lift, 5" PMF Traction Blocks, 35" Goodyear DuraTrac's, 20x10 Novakane's, Firestone Ride Rites, Cross-Trax Sled Deck, Alpine INA-W900 with JL 13TW5 sub