Well I sold it, bought another 2015 with 5.7 long bed 4x4 4 door, same configuration same gear ratios (3.73) same trans and well it gets significantly worse MPG. On the same run with the cruise set at the same speed yesterday I was only able to manage 18MPG with this one so I got some work to do. I know it may be a tiny bit cheaper to operate this one as it runs perfect on low grade gas but the TQ has taken a huge hit with this 5.7. Even towing, or normal driving it is sucking more fuel than the 6.4 truck did with a lot less TQ.

I have another 6.4 just sitting around and like I mentioned before I am trying to decide exactly how to configure it, I am leaning toward SRT8 pistons, BGE heads and 5.7 cam, exhaust and intake... should give me a tiny bit more compression and a little more airflow thru the heads and extend the RPM up a tiny bit without hurting the bottom end TQ.