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Old 05-30-2016, 04:09 PM   #71
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2012 22' FB Sport
2003 19' Bambi
Port Townsend , Washington
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Posts: 209
Great info, thanks everybody for contributing.

It's not a wide range really - there's the low end (9-11), the slightly better range (12-14), and the best you could hope for (15+). Tow vehicle seems to matter as much or more as the trailer size.

We're lucky fuel prices are where they are now. No guarantees they are going to stay there though!

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Old 05-30-2016, 05:48 PM   #72
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Corpus Christi , Texas
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Best you can hope for is in low thirties.

That's a TDI Jetta with a small AS.

From 20-30 mpg is the province of Eurodiesel SUVs.

But I'd bet a Ram Ecodiesel owner could break 20 with a reasonable trailer and travel speed.

1990 35' Silver Streak Sterling; 9k GVWR.
2004 DODGE Cummins 305/555; 6-manual; 9k GVWR.
Hensley Arrow. 10-cpm solo, 18-cpm towing
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Old 05-30-2016, 08:03 PM   #73
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2007 27' International CCD FB
Nomadic , USA
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The 6.4L has been doing great. I use the Fuelly app to keep track of our gas usage.
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Family of 4 living, working & exploring the USA in our Airstream.
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Old 05-30-2016, 08:20 PM   #74
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2012 25' Flying Cloud
Battle Lake , Minnesota
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Our 16-18 mpg towing is good and saves us some money, it's the 29-30 not towing that adds up and one of the reasons we got it.
Doug and Cheryl
2012 FC RB, Michelin 16, ProPride 1400
2016 Ram 1500 Laramie Crew Cab 4X4 Ecodiesel 3.92 axles

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Old 05-31-2016, 05:14 AM   #75
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1969 29' Ambassador
jacksoonville , Florida
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I guess I should be pleased to get as high mileage as I do pulling my 29-foot ambassador -- my 03 diesel ram 3500 tows it at 17 - 22 mpg. that's not being in too much of a hurry (55 - 65 mph) and it is pretty flat here in Florida.
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Old 05-31-2016, 03:59 PM   #76
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Greenwood , Mississippi
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I average 12 mpg at 65 mph.
I have gotten as good as 13 mpg and as bad as 10 mpg depending on headwind, tailwind, or crosswind.
2013 Classic 30 Limited
2007 Silver Toyota Tundra Crew Max Limited 5.7 iForce
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Old 06-06-2016, 09:42 PM   #77
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1966 24' Tradewind
1995 34' Excella
Lynchburg , Virginia
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2008 Tundra 5.7L 2 wd with a bed cap towing a 66 Tradewind. Towing weight is about 5,000 lbs. We get about 13.5 mpg towing gently at 60 mph.
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Old 06-08-2016, 08:43 PM   #78
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2011 28' International
Chatham , Ontario
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2011 Toyota Sienna V6 3.5L (Can-Am modified), towing 2011 28' International Serenity:

Over 12,241 Miles I've recorded an average 13.03mpg.

We're mostly in flat terrain and do short trips, normally. We have had a family of four, luggage, plus the greyhound, but have also traveled light with just two adults. No generators, firewood, kayaks or bikes.

Best mileage is obtained at 50mph (non-highway), worst (on any terrain or road) when suffering a headwind.

Hope this helps.
Steve; also known as Mr UK Toad

"You can't tow that with that!"
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Old 06-09-2016, 09:03 AM   #79
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Portland , Oregon
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On a level interstate, 60-65 MPH, I got 13.8. '16 F150 3.5 EB, max tow, 4x4, premium unleaded, tires inflated near max. 2002 25' Classic, empty tanks.
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Old 06-13-2016, 04:17 AM   #80
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2016 23' Flying Cloud
Austin , Texas
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We seem to be averaging 10-12 MPG in general usage with a 2015 GMC 1500 Sierra 5.3L/3.43 combo towing a 23d. When I'm not towing I'll get 18-20 depending on conditions. Our worst was about 8.5 MPG going through the mountains. We discussed going diesel on this trip... I did talk to two different folks who had RAM Eco Diesels and both were pulling about 6,000 lbs (roughly what the 23d loaded is)... and they were both getting about the 10-15 MPG range depending on conditions. Which makes me wonder how folks here are getting the MPGs that are stated here. One guy also mentioned that he had very little power when pulling up steep climbs.

I know this isn't a scientific study, but looking at the results made me wonder what some of the other factors were in their mileage.
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Old 06-14-2016, 04:44 AM   #81
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2014 25' FB Flying Cloud
Mattituck , New York
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Previous to our 2016 Eco Diesel we had the Hemi,
Last October we began our trip with the diesel, NY, Texas, Calif, Washington, Idaho, Utah, Arizona, New Mexico, Colorado and back to NY. Over 15K Miles. Plenty of power going up the many mountains. 8 Speed ZF transmission was great. Under 60 mph we had 18 MPG on the flat ground.
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Old 06-14-2016, 08:03 AM   #82
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Apache Junction , Arizona
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Our 2007 Mercedes ML320 CDI diesel all wheel drive (has a pre DEF fluid 3.0L turbo diesel with 152,000 miles on it) gets 28.5 mpg on the interstate at posted speeds. Attaching our 2015 23D International Serenity (at 6,068 pounds) and driving 55 mph we can see over 16.5 on the flats and 12 mpg coming out of Phoenix on US 60 through Salt River Canyon with lots of 6% long up and down grades.

I would hazard a guess that the newer 3.0L turbo diesels would get similar results as there are only so many BTUs of energy per gallon of pure diesel and even less in bio-diesel.
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Old 06-14-2016, 08:46 AM   #83
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2015 16' Sport
Pineola , North Carolina
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16 Sport with a 2015 F150 4x4 standard v8
(Non eco boost) at 64 mph, between 14.2 and 15.3
"Certainty on any matter is not one of the human attitudes the Gods admire or tolerate."
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Old 06-14-2016, 10:09 AM   #84
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2016 30' Flying Cloud
Maple Valley , Washington
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Not sure yet...picking up the new FC 30 today and will make my first trip this weekend. From what others are reporting, looks like I can expect in the ballpark of 11-12mpg with my setup. I am coming out of a Class C that got a solid 8-9mpg so.....a 20-30% increase in my towing MPG with my new set up is more than a welcome benefit of going back to a travel trailer.

2016 Flying Cloud 30 Rear Queen
2016 Ford F150 SCrew 4WD 3.5 EcoBoost 7000# GVWR
2016 BMW X1 xDrive28i
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