The one thing I have seen thus far for the MPG rating is, you have to get the 2WD version to get the 30 MPG. And the article states that a 4WD version sacrifices 5MPG. But we all know how EPA estimates can be.
2017 F-350 CCSB 6.7L
[old]2002 7.3L PSD, 6spd, 4x4 Off-Road, Super Cab, Short Bed, ARE Topper, SCMT Autometer gauges, Tymar, 4" SS aero-turbine exhaust, & WW.
'73 Bronco 351 SEFI, 35's & Locked!