I now have 3500 miles on my 2020 F-350/SRW/Long Bed/4X4/6.7/10 speed
I have a gvw of 12,400 and a payload of 4562#
I tow a 16,500# Fifth Wheel with a smile on my face! The combo of the improved 6.7 along with the 10 speed is NIGHT and DAY better than my old 2015 6.7.....
I am averaging right around 11 now with my trailer in tow, where I was at 8.5 to possibly 9.... Without hills, I am averaging 12 if I keep it under 65 on the flats.
** UPDATE **
Just took a 175 mile trip and averaged 11.5.. that included all the secondary streets and highway...
I had the cruise set at 64
Me-Her-the kids
2020 Ford F350 SD 6.7
2020 Redwood 3991RD Garnet