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 > Diesel Towing MPG With Ultralight Trailer

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jdc1

Rescue, Ca

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Posted: 07/11/20 08:19pm Link  |  Quote  |  Print  |  Notify Moderator

My 2001 Dodge Ram 2500 5.9 diesel saw 19mpg empty, 13 towing 7,500 lbs.
My 1997 F250 460 gasser got 7-8mpg empty. Forget towing....too expensive.
My 2000 F350 7.3 diesel sees 15-16mpg empty, 12.5 towing my 8,000 pound 5th 5th wheel..

mtofell1

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Posted: 07/11/20 09:47pm Link  |  Quote  |  Print  |  Notify Moderator

Grodyman wrote:

It gets 7-9 mpg towing an untralight 4500lb trailer


I'm sensing a litte, "cooking the books" here. I get 9 with a less efficient gas engine pulling an 11,000# 5th wheel out west in the hills. Your Ecoboost has to do better than 7-9 with a 4500# trailer.

It sounds like the diesel will make more sense for range between fuel stops but the money saved on fuel alone will never pencil out in any reasonable amount of time.

1320Fastback

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Posted: 07/11/20 11:35pm Link  |  Quote  |  Print  |  Notify Moderator

7-9 is completely in the EcoBoost towing mpg range. The engine is either in Eco mode or Boost mode. Its one or the other, never the both at the same time and when it is in Boost it is dumping fuel in. I didn't catch the towing speed either but the faster you want to pull that parachute the more boost and more fuel your going to use. A EcoBoost towing at 75 will be getting 7mpg.


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Me Again

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Posted: 07/12/20 07:29am Link  |  Quote  |  Print  |  Notify Moderator

I went from towing a 16k high profile 5th wheel to Arizona and back twice to a 8K TT twice there and back. Mileage between them was almost the same the first year I towed the smaller TT. Last winter I towed the smaller trailer without T/H on and sped up to 65-66 MPH vs the 60 MPH I towed before and allow the truck to shift into 6th gear. Mileage went up ^^^^^^ 1.5-2 MPG. In T/H it will not shift to 6th until over 65 MPH.

I run things through my mind all the time and one is do I really need a SRW 3500 to tow a 8K TT back and forth to AZ from NW WA. The answer keeps coming out the same. Why give up a truck you really like and that tows the TT effortlessly. I do not even bother installing the sway control anymore as the 8K trailer does not push around the 8500 lb truck at all. I do use the equalizer bars.

The diesel trucks have a big advantage going down mountain passes in their exhaust brake.


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theoldwizard1

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Posted: 07/12/20 07:42am Link  |  Quote  |  Print  |  Notify Moderator

wowens79 wrote:

Unless you are towing 50k miles a year the cost of the diesel will never be recouped in fuel savings. I think that Eco is probably about the perfect setup for you trailer.

Concur !

First, the days of great fuel economy with diesel engines are long gone !

Second, around where I live, diesel fuel is at least 20% higher cost.

Third, add the cost of DEF.

Fourth, diesel engine oil changes with filters are expensive ves new spark plugs every 100k miles.

Lwiddis

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Posted: 07/12/20 07:51am Link  |  Quote  |  Print  |  Notify Moderator

Your F150 should do much better. I get 12 to 13 pulling 5000 pounds but am rarely over 55 mph.

[image]


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agesilaus

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Posted: 07/12/20 09:52am Link  |  Quote  |  Print  |  Notify Moderator

"Third, add the cost of DEF"

That cost is microscopic compared to the other costs, it's a fraction of a cent per mile. I just added a $7 bottle of DEF after more than 4000 miles of mostly towing this summer.

You also did not add in the higher resale value of a diesel and it's longer life and engine brake. That engine brake is a major factor in my mind.

But the main point is none of those points, it is where you are towing. In the flatlands like the country east of the Mississippi a gasser is fine. In the mountains is where the diesels shine.


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Grit dog

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Posted: 07/12/20 10:25am Link  |  Quote  |  Print  |  Notify Moderator

mtofell1 wrote:

Grodyman wrote:

It gets 7-9 mpg towing an untralight 4500lb trailer


I'm sensing a litte, "cooking the books" here. I get 9 with a less efficient gas engine pulling an 11,000# 5th wheel out west in the hills. Your Ecoboost has to do better than 7-9 with a 4500# trailer.

It sounds like the diesel will make more sense for range between fuel stops but the money saved on fuel alone will never pencil out in any reasonable amount of time.


Likely the difference in speed and driving habits.
If you get 9mpg with a gasser pulling a 11k 5ver, you are the figurative turtle on the road.
However if a guy is clipping across the country at 75 mph in a eco with a full size TT 7mpg is not at all out of line.

I can get 20+ mpg in my Dodge diesel putzing around N WI empty not in a hurry or a personal worst record of 9 mpg only pulling a 3klb cargo trailer ( 80mph westbound into a nasty headwind for hundreds of miles will do that).
Anything that burns unleaded I figure 8mpg one I hook any decent size trailer to it.
I can’t sit in the truck lane crawling along at 55-60 mph though unless the truck or the load won’t accept faster speeds.


"Yes Sir, Oct 10 1888, Those poor school children froze to death in their tracks. They did not even find them until Spring. Especially hard hit were the ones who had to trek uphill to school both ways, with no shoes." -Bert A.

Grit dog

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Posted: 07/12/20 10:27am Link  |  Quote  |  Print  |  Notify Moderator

ageilaus, you’re correct, but diesel haterz will always fail to acknowledge the whole story. Idk why, but they do.

Grodyman

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Posted: 07/12/20 11:19am Link  |  Quote  |  Print  |  Notify Moderator

Lwiddis wrote:

Your F150 should do much better. I get 12 to 13 pulling 5000 pounds but am rarely over 55 mph.

[image]


I generally tow 65-70 mph. 7-9 mpg is pretty accurate, maybe as high as 10 max.
Gman


2017 F150 CC/5.5' 4x4 3.5 Ecoboost/3.55
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