Originally Posted by SCMomentum
Are you checking mpg via the onboard computer or manually?
Calculated manually at the pump, I keep track of it with an app on my phone. The number for my last tank is the lowest I have ever had by 4 some odd MPG. The previous worst was attained on winter blend in the snow...
Originally Posted by ExcursionDiesel
We haven't seen this yet and it may not be the case but it sounds like your DPF is not cleaning out completely from a regen. If it is partially clogged, you would see frequent regens and lower MPG's. 8 got a known bad tank of diesel about 6 months ago and mine regened frequently. 8 know because I watch the DPF temperature. I made sure I let it finish each time. I added Diesel Kleen and ran it to almost empty before refueling at my normal fillup spot (Shell). The new fuel immediately solved my problem.
If you don't drive at highway speeds frequently, you may want to start now.
My mileage is nearly always mixed with about 50/50 of both and I have seen the regen more in the last tank than I have for all the rest of the time I've owned the vehicle. Not kidding, I can only recall seeing the message a few times up till now.
Bad fuel had occurred to me and I have just filled up after going to slightly below empty (as low as I dared to go) to try and rule that out. I did purchase the fuel at my usual location which has never given me a bad tank going back a number of trucks ago but you never know.
At any rate there had been no mention of my particular symptoms in the thread but I thought maybe the hadn't came up since the thread was discussing the shifting, P20EE error code, cats and so on. I suppose this rules out that it has happened to others with the issues discussed here but hadn't come up in the context of the thread.