Terrible MPG with DPF delete?!

[haywired]

I just threw over $1,000 into my truck, hoping to boost my fuel economy from what I was getting with that filter. I have a full 4" downpipe-back exhaust kit, Airaid intake system, and SCT Livewire, tuned at the "Performance" program.

My question is, why did my fuel economy stay the exact same?? I was getting around 11 with the filter (mostly city driving), and I am still getting exactly that.

I have played around with the tunes, and I don't seem to get any better in Extreme, Tow, or Stock programs (all giving me around 11 as well). Highway, I have been seeing around 17-18, which i'm pleased with. Why on Earth is my city MPG so terrible?

I'll also note that the truck smokes a LOT more than I would expect from a Performance tune. It's not just a "puff" of smoke at the initial "pre-boost" acceleration. It's a steady stream of smoke as I moderately accelerate. Even in "stock" program, it smokes wayy more than I'd expect.

Any ideas?

[08stroker250]

Have you thought about going with custom tunes? Also, these trucks weigh a LOT. City driving is not very friendly in the fuel economy department no matter what you do.

[dazed01]

Should I be happy with the 12 I'm getting in town and the 16-17 I'm getting on the highway on my completely stock truck with 3.55's and 17" wheels? What would I be seeing with a tune? I have 900 miles on it and it runs good and I either drive like a grandma or bat**** crazy.

[dazed01]

Another question. I have sync and it's supposed to send feedback to ford about vehicle health. Will that be sending back data showing an aftermarket PCM flash?

[08spartan250]

the SCT programs only say their tunes will boost mpg by 1-2. so not seeing much of an increase in town isnt really surprising. like said above, these trucks are heavy so its hard to see a ton of improvement in town.

[RockinJW]

I'd suggest trying a custom tune out. The standard SCT tunes run decent but I don't believe they turn off the EGR. A custom tune from someone like DP Tuner or Innovative Diesel for that SCT should give you some results you'll be happier with.

[08stroker250]

I didn't realize that Jody had tunes for the 6.4 Jacob. That is interesting news.

[RockinJW]

We've installed his tunes in quite a few customers truck running the standard SCT stuff, they run pretty damn good, though about running it in my personal truck.

[08stroker250]

Originally Posted by RockinJW

We've installed his tunes in quite a few customers truck running the standard SCT stuff, they run pretty damn good, though about running it in my personal truck.

That is awesome. Good work Jody!

[RockinJW]

I don't think it's 550hp tuning, but for the average 6.4L owner with daily driving and towing needs, it seems to work great.