Community Forums

deserteagle5 · 04-07-2022, 10:04 AM

Quote:

Originally Posted by JDT

I do believe it is more frequent when towing.

Just the opposite. When working hard the exhaust gets hot enough to burn off most of the soot without needing to go through a regen process.

A lot of the newer diesel tractors have soot meters on them. Owners claim they can watch the soot meter climb when just puttering around the place under light engine load. Start working the engine hard, to where it gets really hot, and the soot meter drops. Under light load the engine may go through a regen process every few hours; under heavy load regens are rare.

JDT · 04-07-2022, 10:30 AM

Quote:

Originally Posted by deserteagle5

Just the opposite. When working hard the exhaust gets hot enough to burn off most of the soot without needing to go through a regen process.

A lot of the newer diesel tractors have soot meters on them. Owners claim they can watch the soot meter climb when just puttering around the place under light engine load. Start working the engine hard, to where it gets really hot, and the soot meter drops. Under light load the engine may go through a regen process every few hours; under heavy load regens are rare.

Thanks. Didn't know that. You can tell I don't pay a lot of attention to it. I set up the DEF level gauge in my instrument cluster but it does give me a warning when it's down to 800 miles, or maybe it's 500, can't remember as I usually add a 2.5 gallon jug when it gets in the half full range. Probably not necessary as I try to buy the jugs as needed to insure freshness but I do test it with a refractometer before I pour it in the tank.

Outlaw 38MB · 04-10-2022, 03:21 PM

Quote:

Originally Posted by travelorer99

If the compute is the same as hand calculated, it would be great.
What is hand calculated. My computer is wayyyy, off.

2019 F350 6.7 Diesel - Actual calculated MPG based on miles driven and gallons burned is considerably and consistently less than the on board computer calculation. Maybe 1.5 to 2 MPG. That kind of frosts me when I go to the trouble to do the math, but makes me feel good when I don't. I have stock tires and wheels.

Pat_Hoppe · 04-10-2022, 03:33 PM

Quote:

Originally Posted by bigb56

I'd be curious to see a hand calculated average over 8 or 10 tanks. I have an older F-350 4X4 diesel and running solo can bump up against 20 on level ground at 65 MPH (in warm weather). At 75 that drops considerably to around 15 and towing at 62-65 I get about 11-12. What speed are you driving while grocery getting?
Also, I have a newer diesel car with a trip computer that was very "optimistic" by a good 10-15% on MPG, I have since gone into the system and adjusted it down to where it is now very close. It was a bit of a letdown after those initial display numbers

.

The trucks computer and hand calculations are very close on my 2019 F250 crew cab, long bed diesel truck. W/O trailer we get just over 20 mpg. This is a combo of city and highway. Truck is 8100 lbs with wife and I, and a full tank of diesel.

With the trailer (2020 Rockwood Ultralite 2614bs tt, 30 ft)we are just over 16,000 lbs. Towing (mostly Hwy) we get 14.8 on average. Now we travel mostly out west, so there are lots of grades.

I love my diesel truck.

Windyr · 04-10-2022, 03:44 PM

I have an 04 Dodge ram 5.9L cummins and the manual trans and 3.73 gears. It took 50K miles for it to achieve it's best mpg empty of around 22-23. I believe a big part of the slow improvement was the OEM Michelin tires wearing out. I replaced them with an identical set and it went down by about 1/2 mpg. I recently installed some bigger (305 vs 265) and went from load range E to F. Even accounting for the change in odometer reading my mpg dropped by over 1 mpg with the new tires.
With a 9-1/2 cab-over camper(aerodynamic brick) and a 27' enclosed trailer (22k CGVW) we get around 12mpg with no head or tail wind. With a good tail wind we get 14.5. Worst ever with a head wind was 10.5.

Tires really matter. I have a 2dr 1997 tahoe with a cummins 4BT and nv4500 manual trans. With 265 70 16 semi worn out hard tires it would easily get 27-29mpg. I put semi aggressive 305 75 16 all terrains on it and now I struggle to get 25. Jim

frozen · 04-10-2022, 05:06 PM

Quote:

Originally Posted by JIMNLIN

The only way you can figure ""actual"" mpg per tank on a truck is with a pencil.
Many report a single best tank as their trucks actual mpgs.

Were seeing more and more RVers use their trucks in dash 'puters as their mpg figures.

Gotta' learn to use the pencil for reporting actual mpg numbers.

For the sake of argument, over about 5,200 miles towing a 13,000 lb. 5th wheel around the mid-west and Rockies, my computer mileage was 11.49, "pencil" mileage 11.43 mpg. Close enough for me. I drive a 2021 Ram 3500 with HO Cummins.

CamperLifer · 04-10-2022, 07:49 PM

Quote:

Originally Posted by Pat_Hoppe

The trucks computer and hand calculations are very close on my 2019 F250 crew cab, long bed diesel truck. W/O trailer we get just over 20 mpg. This is a combo of city and highway. Truck is 8100 lbs with wife and I, and a full tank of diesel.

With the trailer (2020 Rockwood Ultralite 2614bs tt, 30 ft)we are just over 16,000 lbs. Towing (mostly Hwy) we get 14.8 on average. Now we travel mostly out west, so there are lots of grades.

I love my diesel truck.

Same camper here ! I luv mine.

ViperHauler · 04-10-2022, 10:00 PM

My 2020 Ram dually cummins gets 13mpg combined city/highway empty and about 7-8 towing a 15K enclosed flat front trailer at around 75mph.

Savage1 · 04-11-2022, 07:14 AM

Quote:

Originally Posted by travelorer99

If the compute is the same as hand calculated, it would be great.
What is hand calculated. My computer is wayyyy, off.

Figure your fuel mileage using GPS miles , not odometer or computer reported MPG. Both are notoriously inaccurate.

4x4ord · 04-11-2022, 08:43 AM

^^^My 2011 F350 had a very accurate mpg meter. I had a 2016 which read a little worse than actual. My 2021 read about 7% better than actual before I changed the CAL constant. I think my '22 is fairly close.

RandD Hopey · 04-11-2022, 09:25 AM

I have a 2020 F350 SWR and was very impressed with the fuel mileage whether empty or towing. However I had to take it into the dealer (Jan 2022) for the rear axle recall and they also did the PCM update. Now not too sure if that has anything to do with it but the fuel mileage has changed along with the DEF usage. Truck only has around 10k miles and I have only towed the 6000lb trailer twice so far after the update but I seemed to have lost around 3 -4 miles per gallon. Anyone else seen this?

deserteagle5 · 04-11-2022, 10:06 AM

Quote:

Originally Posted by Savage1

Figure your fuel mileage using GPS miles , not odometer or computer reported MPG. Both are notoriously inaccurate.

Consumer-grade GPS is not all that accurate either.

I am a GPS nut - I have a whole box full of them. Most any trip I take there are at least 2 GPS units running (showing different information and maps) on the dash. Sometimes 3 GPS units depending on what I am doing, like Search and Rescue stuff. Guess what? At the end of a trip of 200 miles or more, even the GPS units don't agree as to how many miles I've traveled.

tileguy · 04-11-2022, 11:05 AM

Hard to believe dome of these high mpg post.
Just got back from a Utah trip in my 2015 6.7 driving along side out friends with a 2021 6.7 we both have the exact toyhaulers at 14000 pounds, 13.6 tall I was averaging 7 mpg he was at 8 and we kept them at 60 to 63 mph. Both trucks are 4x4 f250 short boxes

Klieva · 04-11-2022, 11:54 AM

Quote:

Originally Posted by Homeby5

This isnt some bragging posts. Just some feedback from my truck after about 4 months regarding the fuel mileage.
We all know we dont buy tow vehicles based on fuel economy. We buy them as a tool. Having said that, I gotta say, so far I'm impressed with my new F350 6.7L.
Truck has1050ft/lbs of torque and 475HP...all while getting almost 24mpg on the highway when picking up groceries.
I'm itching to see how much it will drop when I pull my 26ft TT through the mountains in a couple weeks. I'm assuming I'll see about 15-16 mpg? If so...I'll be pleased because my E150 van gets only 15mpg with nothing hooked to it.

I would have to say im impressed.
Must be 2022 F350. I recently read an article about the F350. Basically said that the 6.7 had been improved to 1050 pounds, had increased power and mileage. I have a 2019 F350 with the 6.7 diesel pulling a 2022 43' fifth wheel. I'm happy when I get 14/15 around town and 10 pulling my trailer on any kind of terrain.