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Old 05-15-2015, 02:31 PM   #1
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How bad does your MPG suffer when towing?

Yesterday evening, I towed my new 29' RV trailer for the first time since buying it last week. Brought it home to load up and prep for tonight's sojourn an hour south to Galveston Island to get my RV feet wet.

The storage is about 29 miles away. I noticed I typically get about 21-23mpg on the highway. With this being my first tow, I think I was getting about 8 mpg.

Can I assume this is par for the course for such tows with my setup? My signature line describes what I have. Or, should I be doing something differently?

Furthermore, my RAM still goes into ECO mode knocking down to 4 cylinders. It's a 5.7-Liter V8 HEMI MDS VVT Engine. My dad thinks it's probably not good when towing putting more stress on the engine but I noticed it went to ECO mode often while towing. Thoughts on this?

Appreciate the feedback.
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Old 05-15-2015, 02:49 PM   #2
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With your setup.. yes. That's going to be about par for the course. Loaded you're looking at around 6k. I wouldn't expect much better than that with a 1500.
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Old 05-15-2015, 02:49 PM   #3
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Rule of thumb for trailers other than small popups ... about 1/2 your empty MPG while towing.
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Old 05-15-2015, 02:54 PM   #4
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8-9 sounds right!

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Old 05-15-2015, 02:58 PM   #5
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Quote:
Originally Posted by dieselguy View Post
Rule of thumb for trailers other than small popups ... about 1/2 your empty MPG while towing.
That's HIGHLY subjective. If you're running your TV near max gross then that probably does hold true, but not all folk choose to tow on the fringes.
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Old 05-15-2015, 03:04 PM   #6
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That's about right for MPGs. If you have the tow/haul mode engaged it should not go into Eco mode. I would make sure you engage the tow/haul mode whenever you tow.
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Old 05-15-2015, 03:15 PM   #7
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Yarome ... I'm in the 12.5K plus crowd and most always have been. Most of us pull with Powerstroke, Cummings, Duramax engines coupled to 3/4 and 1 ton trucks. Most all of us get about 1/2 ... maybe a bit better going from unloaded to loaded. I assumed gassers would parallel as I did say rule of thumb.
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Old 05-15-2015, 03:18 PM   #8
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That's why I went to a diesel engine truck to improve my towing MPG's. With my old 2001, 6.0L gas engine, 2500 Chevy I would normally see 6 to 7 MPG towing a light 30' 5er. I than switched to a 2008 Ram, Cummins 6.7L (diesel engine) and I normally see 11 to 12 MPG when towing a mid-size 5er. This depends on fuel quality and if it is straight D2 and not that BIO crap that BP pushes. I have 7 and ½ years of fuel data to back that claim up. When not towing I can see 20 MPG’s with the truck at 65 MPH.

I haven’t really towed my new Cedar Creek any distance yet; to see if there is any difference in fuel mileage between my older 5er and the Cedar Creek.
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Old 05-15-2015, 03:35 PM   #9
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Without the trailer we are getting around 30-35 mpg. With the 24' trailer loaded with 2 bikes we usually get around 20 mpg.
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Old 05-15-2015, 03:36 PM   #10
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I tow a Rockwood 2703ws loaded about 7200 lbs behind a 2013 f-150 5.0 I get 16 w/o and 10 towing. I don't want a diesel. The additional upfront cost and higher fuel cost does not compute for me when I trade trucks every 6-8 years.
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