Ram 2500 6.4 gas Towing 5th wheel.

Martyn wrote:
I have truck and fith wheel as shown in my signature. It tows/pulls like a dream and half the time you don't know it's back there. Recently completed a trip from Florida to Ontario and back and no issues. 10.5 mpg for the whole round trip. I used to have diesel truck but went with this one for the extra payload capacity for the 5er and due to the price of diesel. I used to get 10mpg towing with my diesel, so I am coming out ahead right now!

As to the coil springs - never noticed any difference from the leaf springs in my old 2002 CTD.

10.5mpg? Roflmao

One of our long time members posted this about his then new 2014 2500 Ram with rear coils vs his older '07 3500 srw towing his 12k lb 5er (with both.)

*** ib516

Way up north eh

Senior Member

Joined: 04/18/2003

Posted: 10/05/18 12:32pm Link | Quote | Print | Notify Moderator
I hooked a 14k 5er to my coil sprung 2500 and it sat level. I regularly towed a 12k 5er with no issues. In fact, the 2014 2500 with coils sagged less with the same 5er than my 2007 3500 SRW did with Torklift Stableloads installed.

Here's a 12k 5er that's 37 feet long with 3 slides (one of which is over the pin) and all stock rear suspension...IIRC, the pin weight was right around 2000# when I weighed it.***

Seems hauling tall top heavy truck campers with the 2500 Ram rear coils gets the most negative opinions.

ScottG wrote:


Good info. What gearing do you have?

3.73

Grit dog wrote:


10.5mpg? Roflmao

If you say so! Every tow trip with the old Cummins and with this 2019 Hemi, I religiously keep track of mileage - not the computer, but by topping up and calculating. On highway and not towing I can often get over 22 with the Hemi. The old Cummins would struggle to get 16.

If you doubt me, please fly to Florida and I will give you a demonstration....

Martyn wrote:

Grit dog wrote:


10.5mpg? Roflmao

If you say so! Every tow trip with the old Cummins and with this 2019 Hemi, I religiously keep track of mileage - not the computer, but by topping up and calculating. On highway and not towing I can often get over 22 with the Hemi. The old Cummins would struggle to get 16.

If you doubt me, please fly to Florida and I will give you a demonstration....

While I don't claim to know your actual MPG.
It's not likely that a 6.4 hemi is getting better MPG's than a diesel.
It is simply not the results or experience of most gasser owners

^Correct. Only the people who somehow get 4mpg better than what the mfg stated highway fuel economy is can also magically make the same vehicle more efficient(fuel consumption wise) than a diesel.

I stand by what I said, because it is true. If it doesn’t conform to accepted ‘standards’ that is nothing to do with me. My 2019 hemi gets about the same MPG towing my 5er as my old 2004 Cummins. I was surprised when it worked out that way, but it did.

Martyn wrote:
I stand by what I said, because it is true. If it doesn’t conform to accepted ‘standards’ that is nothing to do with me. My 2019 hemi gets about the same MPG towing my 5er as my old 2004 Cummins. I was surprised when it worked out that way, but it did.

Comparing a modern vehicle to a 15 year old vehicle has little value.
A lot of innovation occurs in 15 years.
Any 2019 vehicle is superior to its 2004 version.

22 mpg out of 3/4 ton hemi? What does fuelly.com post? 14 unloaded? Your posting 22 mpg, a half ton hemi doesn't reliably get that. I think you forgot to "carry the one" doing the math. Even in a place with no hills and at sea level, your not reliably getting 22 mpg. Short of being pulled by a tow truck, that aint happening.

Lantley wrote:

Martyn wrote:
I stand by what I said, because it is true. If it doesn’t conform to accepted ‘standards’ that is nothing to do with me. My 2019 hemi gets about the same MPG towing my 5er as my old 2004 Cummins. I was surprised when it worked out that way, but it did.

Comparing a modern vehicle to a 15 year old vehicle has little value.
A lot of innovation occurs in 15 years.
Any 2019 vehicle is superior to its 2004 version.

Not sure why you’d say there’s little value in the comparison. Of course there’s advancements. But apple to apples the mpg comparison is valid. And 10mpg towing a 10k 5ver with a 3rd Gen Cummins is realistic and within range of what is expected. However at the same speeds and conditions one would expect to get max fuel mileage like Martyn is claiming out of the new Hemi, the old Cummins would do better than 10. More like 13. Based on my 200k miles of ownership of a 3rd Gen Dodge diesel.
The towing mileage is not near as laughable as the bobtail mpg claims.
My 6.4/8HP car with 3.09 gears, at about half the weight and twice as aerodynamic “can” get 22mpg + average if one were to clock it on some flat 55-60mph highway. It won’t get 22mpg avg even doing the speed limit on the freeway (70-80mph). Avg overall is around 19mpg. Zero chance any HD gasser pickup, new or old, gets 22 mpg or even anywhere near that regardless of speed or conditions unless the conditions are downhill with a tailwind. Lol
Yes gasser mpgs have increased a fair amount since 10-20 years ago. As has power and comfort. Whereas the mpg on light/med duty class 2-5 diesel trucks has stayed about the same since they got to be quite capable about 20 years ago. Except the early tier IV emissions models took a big hit in mpgs for a few years until the mfgs made the after treatment more efficient. Now they have way more power and gears than 20 years ago and still maintain similar mpg numbers.