I have a z71 4x4 avalanche, I can get 21-22 on the hwy if I drive like a good boy. I averaged something around 16-17 towing a landscape trailer and the busa to CO and back from NC.
Towing my 7x16 enclosed trailer, 12mpg...saw as low as 9mpg when driving a little fast
Towing my 7x16 enclosed trailer, 12mpg...saw as low as 9mpg when driving a little fast