You are now getting 22.22, that's quite an improvement so far.
Thanks for informing me about the 31 MPG dually. There is hope for me too. I was thinking on getting mine to 25. I will do a search.
There was an article in Diesel Power or World, about a 2nd gen that had 1.4 million miles on it w/ no major overhaul.
These are great diesel powered vehicles that's for sure.
As a local blues singer used to say, thanks for the Cummins,
Dave