Stock 2018 CC Drw stock tire size, 4Wd 4.10 w/68 trans. Getting 7.5 to 9.8 towing 16k# horse trailer 35' long 11.5' tall.
14.9 to 16.9 running empty. On a rare occasion perfect conditions I got 19.9 running about 60 mph.
Towing on hwy I'm usually at 65 mph. About the same empty, maybe closer...