Here is a picture from this weekend. Did an 80 mile drive, reset after I got on the freeway, I watched the last twenty miles to make sure it had a chance to get settled down, it ran between 27 and 27.8 MPG, at 5 to 8% throttle and 3 to 8 PSI boost, some flat, some rolling hills, 65MPH. If I were to have stopped and filled up I would have to believe I was getting between 20 and 21 MPG.
I'm running an older H&S on the 300HP tune, don't drive it like I stole it.

 

27.5mpg's. Too bad that ain't true!!!

 

That would be sweet!

 

As someone else mentioned, downhill, 65, in neutral and a tailwind just maybe you can get 16-17, oh yeah and drafting an 18 wheeler.
Just kidding, If you are consistently easy on the go button, steady 65 on the flat, level as a pool table and absolutely NO headwind you may can get 16-17.
Oh and slow granny starts help a lot. Just not my forte.

 

The last few tanks I have been very careful how I drive, trying to get maximum fuel economy. I just filled it up today and hand calculated it. 7.483km/L. That works out to 17.602 mi/gal.

That's 618.4km on 82.637 liters fuel.

I never pay close attention to what the LOM says but I think it's showing 13L/100 km. I don't know why it can't display km/L but at any rate, actual is 13.363L/100 km so it's not deplorably far out.

 

All these letters are out of my league. Delete DPF is what I want to do. My truck is regening every 70 miles. Too soon, right? What about passing smog test and do I need to do a manual clean on the DPF yearly just to keep it clear?

SPECS:
2008 F250 6.4L
6" lift on 20/37's

 

I'm afraid you may be out of luck on a smog test, reinstall DPF and re-install factory settings sounds like a real chore to me...but that's just me.
At least on an annual basis.

 

As we speak I'm on the road pulling a 36' 5er 60-70 in the hills on I-10 west of Hou Tx.
Hand calc - 7.5 mpg
😡

 

If you have to do smog test your probably want to take it to a reputable diesel shop and have it checked out, When my truck used to regen it was 250 to 290 miles like clockwork, 70 is way too often.

 

I installed a DPF-4 plus programmer with cat/ dpf delete and saw no increase in mpgs. Before the install the digital mpg readout said 18.2, actual was 15.4. After the install the digital is up to 23.2 and actual is 15.4. With a digital increase of 5 mpg, how can there be absolutley no corelation between the digital and the actual mpg?

 

I just recently went with Spartan and DOC/DPF delete pipe, nothing else. Before the tune/delete I was lucky to see 13 mpg, hand calculated. 12 mpg was more realistic and the LOM was within 1/2 mpg or hand calculations. Just hand calculated a tank with the 210 tune (finally keeping my foot out of it and enjoying all the power), my LOM said 17.8 but my hand calculation was 17.1. I know 1 tank calculation isnt enough data to prove anything, but clearly there is an increase and I will continue to get more calculations so I have an overall average.