man, I was really impressed with the stock 6.7 ford F250 that towed my 10-11k toy hauler on a hunting trip. Pulled hills effortlessly with solid low end torque. Loved it! I don't recall checking fuel mileage.
You get your trans fixed?
I have 2 good 265 75 16 Michelin that I'm going to use off the parts truck i just bought. May have another 2 stashed back home, my bro will check for me.
I'm dying to get the the 1/4 and cut a 11.99999999 lol!!