"285 75 18 mt's that are on it now"


15.2 x 1.1 = 16.7...... I assume you are thrilled?

 

hahahah buys a new DPF, emissions diesel, and gets same mileage as a gasser.....you gotta pay to play with the new diesels.

 

I'll toss my numbers in the ring for gits and shiggles:
2017 F250 KR CCSB 3.55 gear & 20" wheels ... just turned over 600 miles today (I've had it a whole 3 weeks today). Haven't spent more than a couple 12 mile jaunts on the interstate (65MPH), and have split the miles between city and "country highways" (55MPH roads with infrequent traffic lights). I could tell a regen occurred at about 525 miles because I watched the MPG display dropping a bit. The display for lifetime (as short as it is) average says 18.8 MPG. Looking forward to improvement once I have ~10K miles on it.

I traded in my 2010 F150 FX4 with 5.4L V8 and its lifetime average was 14.97 MPG over 5-1/2 years (calculated). Admittedly, I'm waiting awhile before trusting the F250's numbers. The first fill-up indicated the display was optimistic by about 1.2 MPG over the calculated value.


PS to pennsylvaniabo - My stomping grounds are just south of you in Halfway, MD. I played on the construction equipment when they first built the I-81/I-70 interchange.

 

I got 18.09 mpg today over 398 Miles calculated manually at the pump. Computer read 17.7 mpg for the day. 90% highway at 70 mph and 10% stop and go city.

4,000 miles on the truck. 20 inch stock Michelin’s running 5w40 oil. Slight headwind first 200 Miles. Slight side wind last 200 Miles.

I think that performance is pretty good.

 

2017 F250 4x4 crew cab 6.7 all stock here. Mine is sucking pretty bad as well. Towed about 220 miles and miles to empty was 5. Display said 9.2 mpg math at fill up said 7.8mpg. Same trip towing same camper using my 05 excursion 4x4 6.0 diesel 14.7. Set a new trip for the fuel economy display after that trip and over the next full tank or says 16.4. 15.8 by math at fill up. Same driving I'm my 05 F250 crew cab 4x4 6.0 would usually get me about 17.5.

 

I am getting 18 mpg right now truck has 2600 miles on it I picked it up drove straight to Florida fromaryland and back in one weeks. I am happy with the mileage I did notice anything above 70mph starts to make her thirsty though.

 

mine is the same exactly

 

F350 CCLB 6.7 3.55 with 400 miles. 90% city driving I'm about 12MPG. Not great but...
I have noticed the truck drags a decent amount when I let off the pedal at slow speeds. It feels kinda like it's in Tow/Haul mode (it's not that bad) or it's one gear to low. My 2008 6.4 F350 will coast with virtually no drag when I let off the pedal at 20mph.
Anyone else notice this on theirs? Certainly can't help the mileage as I have to stay on the pedal more than I normally would, on my 2008 anyway.

 

I would check the temperature of the brakes after driving it a while. It sounds like one could be dragging. That would certainly kill fuel economy.

 

When mine was first new and then for about the first 1000 miles or so I thought that it was pretty bad at coasting. But now that it has almost 5,000 miles on it I think it coasts a lot better.

 

Front hubs locked?

 

Ok, I'm going to throw this out there. I had a 2011 F250 that got 19-20 MPG with the DPF and 20-22 MPG without the DPF. That is running 69-72 MPH. Now I have a 2017 F350 SRW. Same basic truck as far as rear ratio and set up. The 2017 is getting 15.9 at best in the same exact conditions. Using Forscan I can now monitor the DFP status and the truck is going into regen every 150 miles or so. It regened 3 times on one tank of fuel. I run Diesel Kleen or Stanadyne in every tank of fuel.


I was wondering if the crankcase vent filter may have something to do with it. The video on here says something towards the end about a TSB for the filter. If it is letting oil into the intake system and the truck is burning it and clogging the DFP quicker then it would regen more often. We would never see the blue smoke due to the DPF catching it. Or if the engine is burning oil past the rings or such. We may never see that because of the fuel added to the oil during regen. I use Schafers 5W40 synthetic oil so that shouldn't be a issue either.


What are your thoughts?

 

So much effort has to be applied to these modern diesels, what a hassle.

 

mine absolutely does this. I checked hubs lock before I left dealer and several times since then. Definitely in auto. I wonder if it's the gearing, if so I could always go manual and make it upshift. Barely pushing 300 miles on mine in nearly 3 weeks tho. May just be the break in

 

Unless you are driving like a complete maniac I think a regen every 150 miles is ridiculous. You either have a truck that is making a lot more smoke than it should (injector or turbo related most likely) or you have a DPF (some sort of plugged condition that is not cleaning out) or sensor problem (DPF not dirty but sensor says it is). One of those is probably the OPs problem too.

For reference my 6.2 4x4 CCSB with 3.73 gears and 275/65/R18 tires gets 15-15.5 running 70mph on the hwy with no traffic. Add in some decent traffic (more drafting) and it gets better.