Fuel Mileage Towing, is this right?? - Dodge Cummins Diesel Forum
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post #1 of 38 (permalink) Old 12-05-2019, 02:26 PM Thread Starter
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Fuel Mileage Towing, is this right??

Hey guys, I picked up a 16x7 enclosed trailer a few months back (2250 lbs empty). I pretty much only drive the truck when towing it, all highway too. Anyways, I get about 15-16 Hwy when empty. Towing this monster enclosed trailer with a 3 dirt bikes and some gear (maybe 3000 lbs total including trailer weight) I'm lucky to hit 10 mpg, hand calculated, usually mid 9's. Its a 2016 DRW 4x4 with 4.10s, bone stock, 29,000 miles, no deletes and I never go over 70. Is this normal? If so, what can I do? Don't really want to delete, but damn, this seems ridiculous. I would expect this mpg if I was towing a serious load but not 3000 lbs. Is there a tune that would help without deleting???

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post #2 of 38 (permalink) Old 12-05-2019, 02:40 PM
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I had a 5.7 HD. Started towing with it. I was getting ~10mpg. Dang thatís bad. I bought a 6.7 Cummins, to tow and get better MPG. I now also get 10MPG. So 5.7 gas was 10, and Cummins is 10MPG. The fuel gods shine shadow on me :/


Itís normal too. If I tow heavy, 10MPG. If I tow my empty dump, 11mpg. Donít matter. Guess itís better than 9...

The Cummins does get better empty MPG than the 5.7, ~19mpg Cummins. Although that gets offset by the Cummins maintenance. ( $500 yr in fuel filters, DEF, turbo failure and so on. Could have spent that on gas and drive the 5.7 for ten years). The Cummins and the 5.7 towed the same on flat, main benefit of Cummins is it does not slow down on hills and has much better passing.

My next HD gonna be a Gasser.
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post #3 of 38 (permalink) Old 12-05-2019, 02:42 PM
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My rig is stock, 3.42s' 2900 lb slide-in camper and hauling a 3000lb boat. I get 11-13. I rarely drive UNDER 70 mph.
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post #4 of 38 (permalink) Old 12-05-2019, 02:56 PM
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I live where it is flat and get 18-21 empty and 12-15 towing. All of course if I keep it under 70-72 mph. I had a 6.0 liter gas bowtie b4 this and it was 10 towing and 10 empty. I feel like if you level the playing field a little, that these rigs do get much better fuel mileage.
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post #5 of 38 (permalink) Old 12-05-2019, 02:59 PM
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I get 13 to 14mpg on the EVIC Lie-O-Meter when towing a 5000lb travel trailer.

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post #6 of 38 (permalink) Old 12-05-2019, 03:25 PM
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Quote:
Originally Posted by SeanDH76 View Post
Hey guys, I picked up a 16x7 enclosed trailer a few months back (2250 lbs empty). I pretty much only drive the truck when towing it, all highway too. Anyways, I get about 15-16 Hwy when empty. Towing this monster enclosed trailer with a 3 dirt bikes and some gear (maybe 3000 lbs total including trailer weight) I'm lucky to hit 10 mpg, hand calculated, usually mid 9's. Its a 2016 DRW 4x4 with 4.10s, bone stock, 29,000 miles, no deletes and I never go over 70. Is this normal? If so, what can I do? Don't really want to delete, but damn, this seems ridiculous. I would expect this mpg if I was towing a serious load but not 3000 lbs. Is there a tune that would help without deleting???

Thanks!
It's not about weight, it's about wind drag.

And, a 4x4 DRW truck with 4.10 gears is going to get the worst fuel economy. It'll pull a skyscraper down the road, but it'll suck fuel like it was free while doing it.

I get about the same fuel economy towing a 14K 44 foot long 5th wheel trailer as I do towing a 8K 30 foot long travel trailer, but the travel trailer has much worse air flow characteristics than the 5th wheel when hooked to my truck.

And, deleting won't help you much, for sure you will never recoup the costs in increased economy.

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post #7 of 38 (permalink) Old 12-05-2019, 04:01 PM
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I'm still trying to understand the 6.7's after having 2 5.9's that got anywhere from 18.3 to 20 mpg. My 6.7 will barely hit 15 mpg no matter how easy I drive it, empty. I have a 15k fifth wheel and even super easy Lightfoot towing will take it down under 10 mpg. In October I drove from Pueblo Colorado to the Phoenix area and I was afraid I was going to need to raise the credit limit on my MasterCard because I knew I would be running top speed on the interstate. I had strong southwest headwind all the way so the entire trip was running this thing 75mph at full capacity and I averaged 8.15 mpg hand calculated. My 5.9s wouldn't have done any better towing 15 K At 75 with that headwind. My 2012 is primarily for towing and occasional grocery runs so I've gotten over the bad mpg. My 5.9's were daily drivers and my only vehicles and I'm just happy that I don't have to drive my 6.7 that way. Craig
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post #8 of 38 (permalink) Old 12-05-2019, 05:01 PM
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My 16 2500 gets around 15 empty and about 8-9 towing a 8.5x24 enclosed at roughly 10,000lbs. My gasser got 6-7 pulling the same trailer on the same route. In other words, your experience sounds normal to me.
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post #9 of 38 (permalink) Old 12-05-2019, 05:52 PM
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Quote:
Originally Posted by HeavyTwo View Post
I had a 5.7 HD. Started towing with it. I was getting ~10mpg. Dang thatís bad. I bought a 6.7 Cummins, to tow and get better MPG. I now also get 10MPG. So 5.7 gas was 10, and Cummins is 10MPG. The fuel gods shine shadow on me :/
Same here. A 2500 with a 5.7 and optimized gearing: 10 or so with the enclosed trailer at the speeds I drive. Put an aftermarket front bumper on it and managed to get into the 7s.

Now I'm getting about 8.8 pulling the toyhauler with the 3500 diesel, and a whopping 10 with the 32-foot gooseneck flatbed.
At least that 8.8 is 10% better than what I average with the Peterbilt, pulling its "toyhauler" trailer, which is a 35,000-lb. package.
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post #10 of 38 (permalink) Old 12-05-2019, 06:03 PM Thread Starter
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I totally get the whole drag thing, but this is just a 16x7 enclosed (6'6" height I think). I'm getting mid to high 9's. I used to get high 8s, low 9s when towing a 10,000 lb toy hauler with a super high profile. I just figured I would see at least 12's towing this load. Anyone have any luck with tow tunes or anything? Or would that just be wasting money?

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post #11 of 38 (permalink) Old 12-05-2019, 06:08 PM
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I ended up fixing the aero issues the new bumper created, and got a narrower, extra low V-nose.
Together they resulted in about a 40% improvement with the 5.7.

I think you might be underestimating the wind resistance of your trailer. Loaded or empty doesn't seem to matter much, but a V-nose sure seems to help, for example.
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post #12 of 38 (permalink) Old 12-05-2019, 06:14 PM
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Quote:
Originally Posted by SeanDH76 View Post
I totally get the whole drag thing, but this is just a 16x7 enclosed (6'6" height I think). I'm getting mid to high 9's. I used to get high 8s, low 9s when towing a 10,000 lb toy hauler with a super high profile. I just figured I would see at least 12's towing this load. Anyone have any luck with tow tunes or anything? Or would that just be wasting money?
A dually with 4.10 gears towing a brick shape trailer just isn't going to get that kind of fuel economy at 70-75 mph.

Maybe a 3/4 ton with 3.42's would.

You could always slow down to about 60 mph, that is the best way to get some more fuel economy.

And, run the cruise control as much as possible.
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