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DPF/CAT deleted, MPG got worse, WTF?
Would love your feedback and or ideas.
2008 F-250 Crew cab 4x4 XL w/135k miles
Installed Flo-Pro DPF/CAT delete pipe and S&B Air intake.
Running H&S XRT-Pro programmer.
After install, running stock power and S1M transmission tune (default), my mpg dropped by about 1 - 1.5 mpg.
I was getting about 15 to 15.5mpg. Dropped to mid-low 14's.
Been trying different transmission tunes (S2L, S1L) to see if that helps. Nothing better yet, and sometimes worse. I do a lot of back country driving with hills, 40 - 55 mph, right in the shifting zone.
Was running the standard tune with stock power. Tried switching to the "EASY" tune with stock power. (I only need the + power for occasional trailering applications - getting up the steep driveway with the full10k on the 5th wheel)
For those with experience with these trucks and the various tunes....
What can I do with the XRT-pro and tunes available to squeeze every last drop of MPG out of this truck?
I know, I know, this stuff is supposed to be for performance enhancement, not MPG savings. Look my needs are for longer life and MPG, and plenty of folks talked up the DPF delete as the solution for MPG on the 6.4
I sunk a lot of money into this with the expectation of a big boost, and it ain't there. in fact, it's worse. I know the life of the engine should be better now, and that's good, but my wife is gonna kill me if I spent $1,500 and the MPG got worse.
So, what am missing? My local diesel guy told me to plug back in all the EGT sensors and the pressure sensor that I had unplugged when I deleted the pipe. I did, and at first it seemed to help with the idle speed a little, but has not made any noticeable difference on the MPG.
But the XRT -pro instructions said to remove these, so I am confused...
How do you make these trucks sip fuel?
I also have a flo-pro EGR delete kit I am waiting to install for some good weather / time (working outdoors). I would hope that would help a little, but I know the XRT-pro is already disabling the EGR, so not much I would imagine.
Are there some obvious problems that could be causing this failure to improve that I should look for?
Thanks in advance for all your help.