See that's the part I don't get.
Guy at work was complaing about his 5.0 f150 6" lift and 35s getting 15mpg highway. Other guy with 14 ram and same setup said man i get 20mpg highway no problem.. then they looked at me. It was pretty embarrassing to say 14...
Anywho
I took my truck in and complained about the shifting when slowing down , steering issues, and assorted uconnect issues. They did the rrt's. Seems good so far. According to the dash I'm seeing 2-3 mpg improvement on my normal drive home. Shifting when slowing quick definitely seemed better.
I wouldn't put too much stock in what other people say regarding their MPG unless they tell you 2 things and you actually trust them to tell you the truth:
1) They hand calculate and record every trip (fuelly)
2) They have adjusted the speedometer for tire size changes and have confirmed it is correct
EVICs are almost always off. My 2015 ALWAYS is 10% optimistic. My lifetime hand calculated average is 15.0 and my last 10 fillups are 15.5 average, hand calculated (more highway trips recently). But my EVIC is telling me high 16 to 17...and it has never read below 15.
15-15.5 is about exactly what these trucks should get average based on Fuelly. Maybe 16 for etorque. Mileage will also decrease in the winter.
It is possible the 5th gens are actually more accurate / less optimistic.
I'm sorry but I won't believe anyone's stories of a lifted 4th gen with 35" tires getting 20 MPG. Maybe on one trip, going 55, with the wind. A picture of the EVIC is NOT proof they got that mileage either.