The unfair advantage I forgot to tell was that the Duramax , and others like Cummins and even the newer Ford 6.7 have a disadvantage due to the emission regulations. It really has taken the life out of these engines. I am not really sold on the need for all of those emissions or the fact they burn more fuel than their larger non emission engines.
My personal argument is that if you burn more fuel to clean emission gas aren't you in fact polluting more? Hummm? And what is the real emmision of say a 5.9 Cummins compared to a 5.7 hemi or 5.3 chevy and etc. ? I think we are being a little fooled with these emission changes. My 7.3 with 300 plus thousand miles gets 14 mpg real time and with the same trailer my new 6.7 ford gets about 8-9 mpg ? Plus mention I carry the blue DEF fluid that mixes in the diesel.. That stuff isnt cheap.