My 2010 with the 6.0 and 6 speed got at best one time 13 mpg around town. Most of the time it was about 12.5. My 2024 6.6 10 speed is getting almost 13 around town and it is not even close to broke in yet. I think it will be close to 14 after it is broke in. The truck also is about 1300 lbs heavier.
I forgot to say that 12.9 mpg is all around town but 1/2 the time having around 800 lbs in the back. the most in the back i have had so far is 2200 lbs.
I am getting 12.9 MPG all around town in my 24 6.6 gas job. The truck is saying 12.7. This is with 600 miles on it. If I can get 14 MPG when broken in I will be happy.
They made the first one wrong. That one took 5 months. I am not paying $50,000 for for just a C&C 4X4 than pay even more for a body to be put on. So I will wait.