Thanks Ty, I'll wait till next regen and see what happens.

Dave

 

Okay this is for anybody wondering how to enable the 3rd ghost screen to show the DPF% PID. I'm posting up here for FYI. I will be doing mine at one point and had always saved this shortcut.

Larry kindly posted on this thread awhile back.

https://www.ford-trucks.com/forums/1...play-page.html


But I also wanted to comment here about fuel economy and regening in general. I have always read different people's comments about how the regens will severely lower the MPGs. I call BUNK on that. If your driving habits are keeping the emissions happy, and regens are completing like they are supposed to, then you will still get good fuel mileage. Granted, I know that every truck is different. My truck gets good fuel mileage without always towing a load or hauling weight because my daily use includes expressway driving, climbing hills and regening on that expressway. Now I would understand someone deyeting because maybe their truck had issues the dealer could not fix. But the guys that do a ton of stop and go driving unloaded in the city, don't let regens finish or don't know their trucks are regening, let their trucks idle a lot, they will have problems. A good example of that is my buddy who owns the collision shop. He has a 2017 F550 6.7 flat bed. It only has 6k miles or so. It has gotten the "DRIVE TO CLEAN" once or twice according to my other buddy who works for him. I just called him up now as he towed for the city today at work. He said the owner will be getting rid of the truck before it hits 10k miles. I never knew that was the magic number. My point being is this, he should have never bought the 6.7 F550. He had an older gen 6.7 that he got rid of. That is just how he is. It's probably better he gets rid of them before they have problems. He also just traded in his 17 F250 6.2 for a 19F350 6.7. He thinks I'm nuts with this stuff. I told him, "Just do me a favor and let me know when you get the drive to clean message on that truck."

Okay back to my point. My point is that these trucks need to worked or at least driven so that the emissions will do what they are supposed to. I realize there are exceptions to every rule. These are not suitable as grocery getters. I am learning as I go here as I never knew this when I bought my truck. Thankfully my driving suits the truck and I am good to go. With all this stuff coming down from the EPA, I want to keep my truck stock and happy. Also, I get good fuel mileage out of my truck because my truck's regens are far out, the truck passive regens some and they complete on an expressway allowing the EGTS to get 1100 to 1200 degrees. My last 15 mile regen was about 455 miles out and happened before my last fillup. The truck said 14.6 mpg and hand calculated was 15.80 mpg. The specifics are as follows: fillup at 48,434; regen at 48625; and fillup at 48,779 with 21.85 gal (truck said 23.7 gal used). I've always had better than what the truck tells me.

 

A regen takes about .8 gallons of fuel as I have measured what was used during a manual regen on my '15.
Most that have calculated it say that regens reduce fuel economy from 7-8%. At 10 mpg that's .7 to .8 mpg and at 18mpg that's 1.26 mpg or so lost. That's not small potatoes

 

When I said that I get good mileage with a regen, I guess I should have put in a disclaimer saying it uses some fuel to complete. I realize that it takes fuel to complete one. I was just addressing some who think a truck that regens can't get decent mileage. Seeing how these trucks have to have this stuff on these days, I don't have a choice but to burn 0.8 gal each regen. I don't think that's small potatoes. If I had my choice and could get away with it, I would deyete when off warranty and have two tunes, stock and tow. Since that is probably no longer a viable option, I have to deal with burning that extra fuel. I'd love to get an extra mile or so in the MPG dept. Hence, I'll turn to the aftermarket to help me try to achieve longevity and more mileage per gallon.

 

Those numbers are way off. If you regen every 500 miles, as many do who are actually working their trucks, and we take your .8 gallon/per regen at face value, the numbers work out like this:

In 500 miles, a truck that gets 10 mpg would use 50 gallons of fuel w/o the regen, and 50.8 gallons with. So the mileage drops from 10 mpg to 9.84 mpg. A whopping .16 mpg, or a 1.6% decrease.

A truck getting 18 mpg would use 27.8 gallons of fuel w/o the regen, and 28.6 gallons with. So the mileage drops from 18 mpg to 17.5 mpg. Now we're talking a decrease of .5 mpg, or a 2.8% decrease.

Nowhere near the 7-8% that "most" have calculated.

I know that when I'm towing my big fifth wheel I see 12 ish mpg during normal, non-regen operations. When a regen is underway my real-time mileage will dip a couple of mpg into the 10 mpg range. But they don't stay there for long, and overall for that tank (300 miles +/-) I'll see an overall decrease to maybe as low as 11.5 mpg. But the next tank full won't see a regen, so overall it probably does come out somewhere around .25 mpg across the board for me.

 

"Most" that own these trucks don't work them. They are mainly used for commuting, going to the store and pulling a boat or camper on the weekend. These drivers more than likely get about 350-400 miles between regens- some even less. No matter how you figure it, it's still burned fuel that isn't used to move you any where

With three trips from Texas to CO and towing from 10k to 16k I can make it the whole way (650 miles) without a regen. A few miles after I dump the trailer a regen starts.

 

I still don't see your point here. Actually, you are saying the same things I said but in a different way. We all know it takes additional fuel to complete a regen. I agree that it's fuel not being used to move the truck and/or load.

I know exactly what you are saying when you say that you don't have a regen for over 500 miles because you are using the way it's supposed to. EGT Temps are over 570 degrees which is causing the soot to be burned off passively while towing.

I've had at least 3 times when I recorded regens over 500 miles, not by much, when I was on road trips to Kentucky where the terrain is hilly as opposed to the flat lands of Ohio which is on my way to KY.

I'm part of your definition of "most." But the driving I do on the hilly terrain
makes me have an average of 455 miles; I just changed my OLM % PID to the average distance to regen PID on my iDash. I think that's pretty good for a guy who doesn't pull anything often. The fact that my regens complete on that expressway climbing up in altitude keeps my DPF clean and functional IMHO.

Dirthawg, another user here, has about double the highway driving I have and his average is closer to 500 miles with his daily driving routine. So for the guys like me who bought their diesel truck because they wanted and didn't necessarily need it, we can still keep the emissions almost as happy as a truck that tows a lot. And any here that owns a 6.7 is probably not happy about burning more a non Renewable fuel source. Obviously, this only applies to us stock dudes or ladies.

 

I average 18+ mpg on on the Instant Economy on the highway at 75mph. Yesterday my truck went into REGEN and it was exactly 10mpg until the 20 or so miles to complete the REGEN and it was back to 18+mpg

So yes, during that instant, the economy drops, but overall for an entire tank of fuel it's a blip on the radar so to speak

 

Let's face it. Folks who bought these trucks mainly for commuting, going to the store, etc. didn't care about fuel economy when they did so. If fuel economy was any kind of factor at all they'd have chosen something more appropriate than an 8000+ pound diesel truck built primarily for hauling big loads. My point is that the extra fuel burned does not begin to approach your 7-8% figure, even in cases where regens take place more often than 500 miles. So why throw the figure around?

I am fine with the regens on my truck. I prefer the sootless and stink-free nature of the newer models.

 

I consider what I get to be good mileage because my last ride was a guzzler due to the rich nature of the speed density software and 4.11s. I'd definitely would have taken what I'm getting now when I was driving my 96.

 

All the talk about not effecting mileage is good, but when the Regen lasts longer than 25 miles, more like 40 plus, that has a much more significant effect on the overall mileage. I'm still having very long regen's, lasting 40 plus miles at freeway speeds and that is troublesome. I just had another one today that was going to go that long although all the indications on Forscan showed things were cleaned already so I pulled off the highway and terminated it after about 32 miles by stopping and putting it in park for a minute then continued.

So my question is, is this something that I can expect to continue or is this an issue?

 

I can't speak for the new gens. No doubt a long regen like that will certainly affect MPGs. That sucks man. I believe the longest I've seen was 26 miles maybe? I wish you luck with this, I really do.

 

Thanks to the Forscan changes and addition of the Derringer with iDash, I can monitor these changes with more data.

Started the truck up this morning and dash showed DPF at 99% full. Drove 12 miles on the highway. As soon as I got on the highway, a Regen started. I was in traffic the whole way ranging from 30-60 mph.

Stopped the truck and parked mid-regent and shut it down. DPF % was at 60%. Got in the truck and drove another 10 miles after letting the truck sit for a couple hours. DPF % was a 45% when I got in the truck and dropped to 30% about 1-2 miles into the highway. Regen never started.

Got in the truck, drove another 10 miles. DPF % still shows 30%.

EGT 1 never got above 800-850. Wasn't monitoring EGT 4.

Question, anyone seen the DPF go from 60 to 40% full after Regen after shutting truck off mid Regen?

When I got out of the truck, you could feel the heat and hear the popping of the exhaust when I parked and you could smell a burning smell. So I'm thinking that the filter kept cooking after it was parked and cooling down and then blew out more soot as I drove the rest of my normal driving.

Truck is a 2019 F-250 with 4k miles.

 

Monitor EGT4. That is post DPF and that is where the passive regens can occur. I can passively regen in the 450F range if I am consist in those temps. Anything above 500F and it gets better at keeping the soot down.
Yesterday I was in the 700's for EGT 4 and it cooked really good.

 

I'm with Senix on this. I'm about the same. When you shut your truck off, the DPF was still wicked hot and it probably burned more off just sitting there. I see some passive REGENing when I get on the expressway on the way home from work. It passive regened about 6% on the way home last night because the expressway climbs in altitude and the hills around my house. I'm at about 350 miles since last REGEN and it's at 95% on iDash. The last regen it went up to 127 or 128 on iDash before it started to regen. I just got my OBD2 adapter last night so I will be using FORScan to enable the DPF % screen.