I have a 2016 F150 FX4, XLT, supercab, 6.5 ft bed, 2.7 eco boost twin turbos, with a 2019 FWC hawk permanently mounted.
Long trips on highways, usually driving 65 -70 mph, I get the following
Ave highway about 14 MPG
worst with head wind 11 MPG, couldn't keep the trans in 6th speed, kept...