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Old 05-25-2020, 07:32 AM   #1
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Fuel consumption oh my

I knew I would drop fuel mileage in my new 2020 RAM 3500 dually while pulling my 2008 Cherokee WolfPack toy hauler. But to get less than 300 to a tank in simply unacceptable.



So now I am researching larger after market tanks. Both in bed and replacement tanks. I like having the entire bed available. So I'm lookin at replacing the stock 35 gallon tank with a 50-60 gallon tank. Or supplementing a 40-50 gallon in bed tanks that gravity feed the stock tank. That would net 80+ gallons. It just increases the range before fuel is needed.



We go some places where a 200 mile range is cumbersome.I know I can get more than 200 miles, but I have to find a fuel stop that I can get into.




What have y'all done.



Not time between shops.
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Old 05-25-2020, 07:55 AM   #2
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TITAN Fuel Tanks
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Old 05-25-2020, 08:09 AM   #3
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We had a tank built in Lake Havasu by KSH Marine. They built a 40 gallon tank with internal pump and all of the switch over hardware including gauge for 1100 dollars installed.

Top notch work. They have all kinds of options including integrated tool boxes. Gave us a schedule and performed as promised. Went one day for measurements and the next day the tank was installed.
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Old 05-25-2020, 08:33 AM   #4
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I have a 25 gallon Enduraplas portable transfer tank that worked very well for us. It can be removed as needed which is what I liked about it, and it fit below our bed cover. It will actually hold about 27 to 28 gallons and takes about 3 or 4 minutes to empty. Our new truck has a 48 gallon tank so I'm questioning whether or not I will use it anymore. I guess it depends on where you travel but most of our trips seem to have plenty of truck stops. I just pull in to the truck fuel pumps and get out as quickly as I can. I can safely go about 400 miles which is about our travel limit for a day.

We did have a Titan tank in a previous GMC truck and it worked great.
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Old 05-25-2020, 11:14 AM   #5
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I installed a 40 gallon RDS brand tank/toolbox combo in the bed. It is low profile so you could put a bed cover if desired. It also makes for lots of tool and accessory storage. All my hitches,winch etc. stay in there, locked. Does not look like a fuel tank and it is simple, gravity fed.

Since mine is a gasser I has to modify the filler neck and take extra precautions, but my installation is legal, safe and all emissions work as before, no issues.
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Old 05-26-2020, 08:25 AM   #6
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8 MPG pulling a 12k max GVW trailer seems low for that truck. However if you are doing a lot of stop and go, off road, or hill work it may be right. Possibly the engine will loosen up. I've read about a lot higher numbers towing significantly heavier loads.

I installed an ATI 41 gallon auxiliary tank in my bed. I chose it because the height was low enough so my tri-fold cover would fit over it. If I recall, the front to rear measurement was around 11" of bed loss which I don't mind. The extra convenience is worth it.
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Old 05-26-2020, 08:57 AM   #7
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I think your engine will loosen up and you will get better fuel economy in the future. You should get between 9 and 11 mpg. But I can also agree 35 gallon tank is not very big. When I had a 2012 Ford Dually I had 37.5 gallon tank and could go 330 - 350miles.

You have a lot of options. I think the Ram Cab Chassis have a 50 gallon tank. Maybe that will fit your pick-up truck.

Good luck
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Old 05-26-2020, 10:20 AM   #8
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2007 Dodge 3500 SRW 5.9L 4:10 w/4 speed auto towing 14K 5th wheel
10-11 mpg ---35 gal tank
If needing to fuel up...pulled into a station and got fuel====tankers get in and out then so can I

Parking in some CG sites was tougher then any service station


Course we re retired and don't have to do Long mileage trips.
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Old 05-26-2020, 05:34 PM   #9
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My 17 ram 3500 srw work truck with 6.7 got 8.5 pulling my 10250gvw jayco in pa. Average is like 13 empty according to the meter. By comparison, my 03 6.0 psd with no emissions got like 12.5 pulling the same jayco and got over 10 pulling my toy hauler here last week across pa and it seemed like a ton of that was up big hills too.
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Old 05-26-2020, 06:43 PM   #10
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Well, here is the dash-o-meter from last weekends trip when I filled up (at $1.77 btw) this am heading to work. 5 minutes from my house. Lots of miles left before empty but price was good at my favorite fuel station, the one with good donuts too! so I stopped. 10,000lbs behind the camper puller. I average between 13-14 all summer long with AC on. It's a Powerstroke! Regularly get 23-24 Hwy empty.
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Old 05-26-2020, 07:16 PM   #11
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80 gallons of diesel is OK. 80 gallons of a volatile fuel like gasoline is asking for trouble.
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Old 05-26-2020, 08:01 PM   #12
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Quote:
Originally Posted by move on View Post
80 gallons of diesel is OK. 80 gallons of a volatile fuel like gasoline is asking for trouble.



I should have stated mine is a diesel. Aisin tranny. And 4-10 gears if I'm remembering correctly. My 2013 RAM 2500 easily got 300 to a tank with the same trip and same camper.
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Old 05-26-2020, 08:17 PM   #13
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Maybe your engine just needs to get through the break in period and your MPG's will increase.
9*35=315. If your getting less than 9 mpg, I agree that sounds pretty crappy for a modern diesel.
I avg. 11 mpg towing with my 2019 Duramax.
2 MPG's doesn't seem like much . But 11*35=385, which is solidly above the 300 mile range threshold.
For the record I do have a 25 gallon Enduraplas aux. tank in the bed.
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Old 05-26-2020, 09:10 PM   #14
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Quote:
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80 gallons of diesel is OK. 80 gallons of a volatile fuel like gasoline is asking for trouble.
Why? A proper fuel tank is a proper fuel tank, as long as it's installed properly. Do you not think some medium duty gas trucks limit tank size to well under 80 gallons?

My setup affords me 74 U.S. gallons and plenty of range.
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