X15 down on fuel economy recently?

[marek4792]

Down 1mpg for the past month, down a gear on hills, coolant temps sitting higher when cruising around 185-190 degrees, hmmm what could this be? Opens up insite this is what I find..
   
   
Even with yearly Egr tune-ups and recently removed and cleaned the Egr Valve and new DPF differential pressure sensor. The turbo burn mark has moved closer to center of the housing too.. DPF was baked at 315k miles approximately, now have 520k miles. Definitely got my moneys worth but will update when it gets pulled to determine which route to take...