I love my 2020 F350 CCLWB FX4 with the 6.7L diesel. Just got back from a cross country run and averaged about 19mpg for the whole trip running 80mph. Saw as high as 21 and the lowest was 17.5mpg when going through the mountains. I can pull my little 17ft Ranger bass boat and get 17.5mpg or my 16,000lb fifth wheel and get 12.5mpg. I’ve had it a little over a year and have 44,000 miles on it already. It’s been flawless.