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Old 07-22-2012, 08:20 AM   #1
Join Date: Jul 2012
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Dodge MPG?

We have a vintage DP and are considering changing to something more modern. One of our considerations is a fifth wheeler. We don't have the truck yet but have been looking at Dodge 2500 and 3500's with the 5.9L Cummins. We would appreciate hearing from anybody towing a mid-profile or high-profile fifth wheeler and tell us what we can expect for MPG. We are also interested in what to expect for performance over the mountains. I am also interested in the MPG comparison between a 2500 with the 3.?? diff ratio versus a 3500 with a 4.?? diff ratio. My brain says the 3500 might not use any more fuel because it is not working as hard but I want to hear from people with experience.

Many thanks.

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Old 07-22-2012, 08:53 AM   #2
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Location: Bellevue, Nebraska
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I can only tell you about my own experiences. We have an '04 Dodge quadcab longbed, with the Cummins 5.9. I think that's what's called 3rd gen. 411 rear end.

Solo, we average 20 mpg.

We tow an Open Range Journeyer, 34foot Travel Trailer, scales at 11,200.

With a tailwind, we get 14 to 16 mpg.

With a sidewind or a headwind, we get 9 to 11 mpg.

Figure it manually with every fill up. We average 55 to 58 mph.

As for performance, just came west across Wyoming, including over the "two sisters" at Evanston (long and steep).

No problem maintaining my 55 mph, with an occasional downshift.

That's my experience.

GL Arnold

2003 Ford F150 Supercab 5.4
1997 Keystone Sprinter 24RL
Former Full-Timers
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Old 07-22-2012, 11:02 AM   #3
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Excellent info. Thank you.
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Old 07-22-2012, 02:28 PM   #4
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Is your Dodge a 2500 or 3500? If 3500, is it SRW or DRW?
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Old 07-23-2012, 08:25 AM   #5
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Have you picked out a fifth wheel yet? Are you looking at 'Dodge 2500 and 3500's with the 5.9L Cummins' as you know that these will match the trailer? Conventional wisdom is to pick the trailer first and then buy the truck that will adequately tow the weight.
Stuart, Lynn, Robbie and Abby
2012 102-F41RLTSS New Horizons Majestic
2013 F550 Super Duty w/Utility Bodywerks hauler body
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Old 07-23-2012, 09:09 AM   #6
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A third-gen 5.9 Cummins towing a mid-to-high profile 5th wheel at 60-65 mph will usually get about 12 mpg (average over time, winds will probably make any daily reading different) and 20 mpg or so empty. Maybe subtract an mpg for 4WD or duallie.
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Old 07-23-2012, 04:42 PM   #7
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I have a 2006 3500 SRW two wheel drive that I pull a 37' Heartland Eagle Ridge with. My mileage numbers are similar the those posted by "glarnold".
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Old 07-23-2012, 07:41 PM   #8
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Thank you to everybody. All good input.
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Old 07-25-2012, 10:32 PM   #9
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We just got back from 5226 miles of towing an Arctic Fox 295T with a dodge 3500, 6.7 litre. First off the most comfortable ride ever. Second average mpg for the entire trip was 10.6. Lots of mountain passes. We were immensely pleased with the performance of the truck but we need a bigger trailer. The 295T is awesome but we just need more room for "full timing". I hope that helps some!
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Old 07-26-2012, 07:33 AM   #10
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Yes, it helps. Thank you.

Is your 3500 SRW or DRW?
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Old 07-26-2012, 07:44 AM   #11
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Location: Cypress, Texas USA
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2002 Ram 3500 DRW with 5.9L Cummins HO, 6-speed manual, 4.10 axle, 2WD:
  • Stock running empty @ 75 MPH - 17 MPG
  • Stock towing 13,500 lb GVWR 36' Jayco Designer XL 3610RLTS (96" wide) @ 65 MPH - 12 MPG
  • Stock towing 16,000 lb GVWR 36' Mobile Suites 36RE3 (102" wide) @ 65 MPH - 11 MPG
  • Larger injectors towing Mobile Suites listed above (347 RWHP, 762 lb-ft torque at rear wheels - ~400/900 at flywheel) @ 65 MPH - 10.2 MPG
2011 Ram 3500 DRW with 6.7L Cummins, 6-speed automatic, 4.10 axle, 2WD:
  • Running empty @ 75 MPH - 16-17 MPG
  • Towing Mobile Suites listed above @ 65 MPH - 10.2 MPG
2016 Ram Longhorn 3500 Dually 4x4 CCLB, 385/900 Cummins, Aisin AS69RC, 4.10
2014.5 DRV Mobile Suites 38RSSA #6972
Come join us on a TEXAS BOOMERS rally!
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Old 07-26-2012, 09:00 AM   #12
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Old 07-26-2012, 03:49 PM   #13
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Unloaded- 18-20
With 5'er- 10-12 at 68-72mph
With boat- 32' long, 11'6 wide, 13'6 tall- 8-9mpg (its like towing a brick wall)
With a 34' gooseneck car trailer- 14-16 depending on whats on it.

I do have a heavier right foot than left though.

Alie & Jim 2009 CarriLite Max1
Volvo Dually Pickup
My keyboard is faster than yours
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