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Old 05-01-2014, 12:36 PM   #1
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Fuel mileage pulling a 5er

We are debating if we should take our 5er from home in north eastern Nebraska to My wife's mothers in south eastern Kentucky. She has a small house and there is never enough room for all of us.
I was just wondering what you all get for fuel mileage. The 5er is old and she is a heavy old girl. Im guessing I will get around 10 mpg. I will be towing with a 07 chevy 2500 with the duramax diesel and allison 6 speed trans. Im not too concerned about the poor mileage I just need to figure out how much to budget for the trip.
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Old 05-01-2014, 12:44 PM   #2
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If you're coomfortable with 10 mpg as your basis. Then just divide it into the number of miles to get there and multiply that by the avg. cost of your fuel per gallon. Double that figure for the trip home.
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Old 05-01-2014, 12:54 PM   #3
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Luckily you have a diesel. Lol I pulled my 27' jayco 5er 200 miles and got between 6-8 mpg highway. Thats in a 2000 F250 with the 5.4. I want a 7.3 TD lol
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Old 05-01-2014, 01:03 PM   #4
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Just made a similar trip. Fuel computer says 10.1 on the flats, 8.2 in the mountains. F250 SD pulling a Montana 5er.
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Old 05-01-2014, 07:16 PM   #5
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My old rig was a 35ft 5th wheel pulled by a 2004 Chevy 2500HD. Duramax and Allison. Averaged 9-10 mpg.
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Old 05-01-2014, 07:57 PM   #6
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????? It depends on your truck, the weight of your trailer, the weight of how much stuff you take with you, the weight of how many passengers, the terrain, and how you drive. I am certain you have checked your MPG in the past, use that figure to calculate the cost for this trip.
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Old 05-01-2014, 08:04 PM   #7
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I pull about 11K loaded and get a calculated average of about 11.5. I seldom make a trip that doesn't involve at least one steep long pass, usually more. Last time I calculated fuel mileage on a long flat trip, I got 13.2. I don't calculate it anymore, if I did I'd probably stay home. My DIC is almost exactly 10% high so I use that to get an idea of fuel consumption when traveling. I try to maintain 1800 rpm, that seems to be the "sweet spot" for economy on my LLY.
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Old 05-01-2014, 10:28 PM   #8
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What's DIC and LLY?

Inquiring minds want to know...

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Old 05-02-2014, 02:36 AM   #9
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What's DIC and LLY?

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Tim
DIC..Driver Information Center..
LLY= code name that particular version of the Duramax engine.

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Old 05-02-2014, 05:00 AM   #10
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Thanks for all your input. If I can get 10-11 mpg I can live with that. Before I got this truck I had a suburban and before that a ford explorer. I had to pull a little S-10 pickup box trailer that I made with a camper shell on it because we never had enough cargo room. I only got 10-12 with that set up.
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Old 05-02-2014, 08:58 AM   #11
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No GM experience, but with a 1999.5 Ford 7.3L diesel, 3.73 axle ratio, mild towing tune, and a 5er that grossed 8,000 pounds, MPG on long trips was consistently related to speed.

62 MPH = 1800 RPM = 12 MPG

66 MPH = 1,900 RPM = 11 MPG

70 MPH = 2000 RPM = 10 MPG

75 MPH = 2150 RPM = 8 to 9 MPG.

Needless to say, I usually cruised at 62 MPH. Speeds slower than 62 didn't improve MPG.

Towing that same trailer with a 2012 F-150 EcoBoost with 3.15 axle ratio about 350 miles @ 65 MPH through the Hill Country from Austin to near Midland, I averaged a hair over 9 MPG. Speed didn't seem to matter as much. The lie-o-meter said average of 9 MPG whether cruising at 60 MPH or 70 MPH. Since that F-150 was overloaded over the rGAWR with that 5er, I slowed down to 65 for most of that trip.
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Old 05-02-2014, 10:08 AM   #12
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2014 Chev duramax 3500 4 whl drive, pulling a 381Lev Raptor(Keystone) 17000 lbs 3900 miles on truck. Best I have seen in a towing condition is around 9.3. Worst has been 7.4.mpg. Always under 62mph. 7.4 mpg included a nice little head wind.
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Old 05-02-2014, 10:11 AM   #13
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Originally Posted by jenandjon View Post
We are debating if we should take our 5er from home in north eastern Nebraska to My wife's mothers in south eastern Kentucky. She has a small house and there is never enough room for all of us.
I was just wondering what you all get for fuel mileage. The 5er is old and she is a heavy old girl. Im guessing I will get around 10 mpg. I will be towing with a 07 chevy 2500 with the duramax diesel and allison 6 speed trans. Im not too concerned about the poor mileage I just need to figure out how much to budget for the trip.

You did not state if the tires are oversize or stock and what differential gear set you have. This will affect you fuel mileage also along with a head wind remember you have a 12 to 13 FT sail behind the truck that you are trying to move down the road.

I have a 2008 Ram Mega Cab with the 6.7L Cummins and the 6 speed 68RFE auto 4X4 and 3:73 gearing and stock tires. I pull a 2010 318SAB Cougar that weighs in around 11K my total load with truck and trailer is 18,200 LBS. I tow at 60 MPH for my best fuel mileage and this is 5 MPH under the tire speed rating on the 5er. I will normally see between 9.3 to 13.4 MPG. This will depend on wind conditions and type of fuel; Bio- fuel will have fewer miles per gallon than regular Dino (less energy content).
My fuel cost in 2008 traveling to MT Rushmore SD was $1060.00 for 2000 miles. In 2011 my fuel cost was $1,240.00 for 4,050 miles when we went to Yellowstone in WY, why fewer headwinds and the price of fuel dropped. We went east in 2012 to SC and GA drove 2460 miles for a cost of $834.00 higher fuel prices and more of a headwind. We are going out east to MA and CT in the fall I expect to spend around $1200.00 for fuel this year.
Jim W.
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Old 05-02-2014, 12:22 PM   #14
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jimcumminsw----We must be following each other because we did the same trips I believe on the same years you did. Guess where we are going this fall? Yep east! Niagara Falls, Adirondacks, Acadia and Gettysburg. Maybe we will see you on the road.
Did you chip your 6.7?
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