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ford truck guy

Pennsylvania

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Posted: 02/07/21 12:11pm Link  |  Quote  |  Print  |  Notify Moderator

my 2020 @ 6.7 will get 22 MPG solos long as I behave !

As soon as I hook uo to the fiver I get just about 10.... sometimes up to 11 and sometimes down to 8 or 9...

It will really depend on the road, and how much I want to get to where I am going..[emoticon]


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lenr

Indianapolis, IN

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Posted: 02/07/21 12:31pm Link  |  Quote  |  Print  |  Notify Moderator

MPG is inversely proportional to work being done. So, when I hook up the fifth wheel I'm moving 2.5 times as much weight. However my experience seems to indicate that aerodynamics of the trailer is big factor at the highway speed that most of us travel. Our 2012 F-350 CCSB SRW 6.7 diesel gets 20 at highway unloaded, 15 around town, and 11 towing at highway (+ or - depending on wind direction.) I've read many reports that the 20 -21 Fords are getting better mileage with the 10 speed and lower numerical axle ratios. But when towing I'd be surprised if they do much better due to the significant amount of work being done. As an indication of the effect of aerodynamics at highway speed our 1) 6500 lb 27' bumper pull trailer, 2) 27' 9400 lb fifth wheel, and 3) 37' 12,700 lb fifth wheel all got around 11 mpg at highway speed. The fifth wheels have/had round nose caps while the bumper pull was classic old flat.

rexlion

Broken Arrow OK

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Posted: 02/07/21 01:08pm Link  |  Quote  |  Print  |  Notify Moderator

I think the mpg variability between different Motor Homes themselves, or between different truck-5er combos themselves, will be greater than any set disparity between the two types of RVs.

I keep dreaming of an RV rig that will get 30 mpg. Well, I actually think I may have found one: a Prius and a Roll-A-Home trailer! It does have some trade-offs, obviously. [emoticon]

* This post was edited 02/07/21 01:29pm by rexlion *


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cummins2014

Utah

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Posted: 02/07/21 01:32pm Link  |  Quote  |  Print  |  Notify Moderator

MFL wrote:

fj12ryder wrote:



14-16 mpg pulling a 5th wheel...hmm. Pretty amazing, nearly inconceivable. [emoticon]


It's those never ending downhills that make this possible. Even the 22 mpg not towing "pretty amazing"![emoticon]

Jerry



I saw that 14-16 ,that is amazing for that weight . I got 13 ONE time ,going thru Texas with a tailwind, haven't even scared 13 since . [emoticon] But I did see 21 a couple times going on some roads at 50-55 mph. running unloaded

fj12ryder

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Posted: 02/07/21 01:52pm Link  |  Quote  |  Print  |  Notify Moderator

My 2001 Cummins Dodge dually will get right at 20.5 mpg unloaded, @ about 65 mph, level road.

The best I ever got towing was coming from Albuquerque to Amarillo. It's mostly downhill, and there was an honest 35-40 mph tail wind. I got, by hand figuring, 14 mpg. That's pulling a 15,000 lb. toyhauler.


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Edd505

Elephant Butte, NM

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Posted: 02/07/21 08:26pm Link  |  Quote  |  Print  |  Notify Moderator

F350 SRW 6.7 pulling 14K 12-13. Join the TSD Fuel program, free to join, lots of info on the net, I saved right at $1000 dollars last year even being locked down. I actually added an 80 gallon transfer tank to maximize my savings.
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94-D2

Sutter Creek ca

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Posted: 02/08/21 12:28am Link  |  Quote  |  Print  |  Notify Moderator

My 2018 6.7 Ram with 295/70/18’s gets 11-12 on flat land with my 15.5k bighorn on. In the mountains, I’m in 9-10 range. I did get 20 on a solo trip to LA with a very light foot. Can’t see a dually getting any better with 4:10 gearing. I used a friends Ram DUALLY and it never got over 10-11 pulling.

I also have a 99 Dodge 2500 with a 5.9 and some minor goodies in the engine. 5” exhaust turbo back, DB manifold, 100 HP injectors, fuel map chip and I got, $hit you not, 16 towing my bighorn on the flats. A light foot solo yielded a whopping 26 mpg, sadly, a 21 year old truck is not reliable enough to take it far for my liking without a full resto. hence the 2018 upgrade. Anyway, I can afford the fuel but I am still milage conscious and would love to spend less to do it. It also kills me to pay a $150 power bill too. So, I save where I can even though I don’t have to.


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ACZL

UPstate,NY

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Posted: 02/08/21 05:15am Link  |  Quote  |  Print  |  Notify Moderator

OP,

If you follow these forums long enough, you'll see many repeat posters and many are truly honest replies. In saying that, I reiterate my point that most Ram's and GM's get better mpg's that do Ford's. If you plan on towing anything north of 15k (RV) it is strongly encouraged that you go the DRW route for safety and if you wish to add an aux tank in bed of truck seeing you'll have more capacity.

So based on the replies you've seen. most folks are getting between 8.5-11 towing and 12-20 empty. Gearing, tranny's, etc all faster into it as you know. My FIL (RIP) asked me many years ago when I had my 6.0 PSD and fuel was going up then about regretting getting a diesel and my reply to him was: "Nope, got it for power". I will say tho, the 6.0 I had did get decent mpg's.


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valhalla360

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Posted: 02/08/21 06:25am Link  |  Quote  |  Print  |  Notify Moderator

rhagfo wrote:

Well only true for Ford diesels, they used high pressure engine oil to pop the injectors which is hard on the oil, and requires more frequent changes.
Cummins doesn't do that and even with our old 5.9, we easily went 10,000 miles on a change verified with lab testing, could have gone 12,500 miles, but 10,000 was about what we put on in a year.


The point is with modern vehicles, you are looking at 1 or 2 oil changes per year unless you drive extreme miles. Oil changes simply aren't a big deal in terms of cost.


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valhalla360

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Posted: 02/08/21 06:29am Link  |  Quote  |  Print  |  Notify Moderator

MarkTwain wrote:

My 2004 Dodge ..... Up hills , down hills or level ground.[emoticon]


If you add the up and down hill miles and they are roughly equal...probably not too far off the mark.

If you have a travel day where you wind up 4-5,000ft higher over 150-200miles, you will notice a significant reduction in MPG.

Likewise, if you have a day where you wind up 4-5,000ft lower, you will notice great MPG.

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