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Old 05-02-2014, 11:28 AM   #15
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I looked up the codes and this is what I came up with

G80 - locking rear differential

GT4 - 3.73 Rear Axle Gear Ratio

I have 265/75 16 tires. Its suppose to have 245/75 16. The 265 were cheaper and fill wheel wheel well better. They are brand new Firestone Transforce A/T.
The truck is all stock with 110,000 miles. Never tuned or modded in any way except for slightly taller tires.
I already figured on crusing between 60/65 and I know wind will change things. I am just generally speaking on a perfect day no wind and sun shine day.
We are going to hit all kinds of different terrain. Flat in Ne, hills in Mo, flat in Ill and In. Then theres Kentucky. Loooong winding hills.

93 Jayco RK 325
07 Chevy classic crew cab long box LBZ Duramax
Farmer, Trucker, Equipment operator, Mechanic
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Old 05-02-2014, 11:36 AM   #16
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I think your 10 MPG number will be in the ballpark. That's the number I use to plan our fuel stops.

I have a 2011 Duramax and pull a 11.5K loaded trailer. My worst mileage has been 9.5 and the best 13.5. The 13.5 was mostly downhill with a strong tailwind and the 9.5 was the opposite, of course...


Numbers is hard...
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Old 05-03-2014, 09:28 AM   #17
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Originally Posted by becken6 View Post
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?
We will be in the Niagara Falls area in late Sept as we pull home. I need to attend a nephew wedding in Newport RI in early Sept. So we plan on staying at the KOA outside of Boston and then on up into Maine and Vermont. I have made all of our reservations for our campgrounds already.

Have a great trip and you may see us in the slow lane pulling a 318SAB Cougar and a Silver 2008 Mega Cab Ram 2500HD.

Yes; I have tuner on my truck it is a S67 Smarty installed in Aug 09. I tow on CaTCHER level 3 it adds about 60HP to the rear wheels.

Jim W.
Jim & Jill
Sold: 2010 318SAB Cougar:New: 2016 Cedar Creek 34RL. 2008 Dodge 6.7LCummins the original 6.7L engine, w/68RFE Auto
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Old 05-05-2014, 06:42 PM   #18
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I made my first trip in the 5th Wheel. Traveling South into approximately 40mph winds (gotta love Oklahoma), I got about 10mpg. A few days later, traveling back North I got about 15mpg. Same wind speed, just now it was a tail wind instead of a head wind. Both runs were at cruising speeds averaging approximately 65mph. I occasionally increased speed just to see what the handling was like. My combination seemed to really like speeds between 65mph and 70mph. Any slower and the truck seemed to lose headway much much easier on slight rises. I also experienced more "chucking" at speeds of 55-60mph. Any faster and I was getting too nervous to really enjoy the drive. The high winds going South made the trip quite interesting though!! I was rather pleased with the results. The truck towed (and stopped) better than I expected. The mileage was slightly better than expected. I had expected 7.5-9mpg rather than 10-15mpg. The trailer is back at the dealership to fix all the things I found wrong. I hope to have it back soon and will then have a few more runs under different conditions to calculate a better average.

I was towing a brand new almost empty trailer for it's maiden run to find out all the things wrong with it. I expect mileage to decrease slightly when its fully loaded. I'm towing with a 2005 Dodge 2500 diesel with factory tow package (4.10 rear end) and automatic transmission. I'm towing a Columbus 3600TH. Once loaded, I'll be right at the limits of this truck's capacity. I plan on upgrading the truck prior to going full time.
2013 Columbus 3600TH
2015 GMC 3500 Denali TV
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Old 05-05-2014, 08:51 PM   #19
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Originally Posted by jenandjon View Post
I looked up the codes and this is what I came up with
I have basically the same truck down to the tire size and brand. I have an Edge chip but set it on "stock" when pulling my 9k+ TT in and out of the north georgia and N.C. mountains. My average is 10.5 mpg. My goal in the hills is to keep my EGT below 1,200. If you don't have a pyrometer to measure exhaust gas temperatures, slow it down a bit on the grades and select a gear in "M" to keep the strain off the engine. I get the best towing mileage at about 1,700 RPM.
If I'm pulling a longer grade, I restrict the shifting to 5th gear.
I don't think weight makes that must difference in mileage. Wind resistance seems to be the killer. I get the same towing a 6,000 TT as I do my 9,000+ rig and considerable more when I towed nearly half again that weight of steel on a flat bed.
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Old 05-06-2014, 05:52 PM   #20
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I'm getting 8ish but she weighs 21,000#
2003 Teton Grand Freedom. 2006 Freightliner Century 120 with Detroit 14L and Ultrashift.. Full time going from job to job. Building and maintaining plants across the USA. Sold 2006 Mobile Suites 32TK3
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Old 05-08-2014, 06:01 AM   #21
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We just pulled a 13,000 pound 5th wheel with an 05 6.0 Ford powerstroke from Arizona to Missouri. Averaged a solid 11.3.
2014 Ram 1500, Quad Cab, Hemi, 3.92, 4x4
2013 Forrest River Flagstaff, V Lite 30', 7300#
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Old 05-11-2014, 09:53 PM   #22
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2012 Chevy Silverado crew cab 4x4, 2500HD.. 42k miles starting to loosen up. No TT, 70MPH, 22 avg mpg. With 34' Airstream this weekend, Texas to Louisiana, TT at 9000#....13.3 running 56mph on gps and speedo. On cruise.

Sent from my electronic leash.
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Old 05-11-2014, 10:00 PM   #23
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I pull a 41 5er with a F450 6l diesel. We are just under 30,000 when travelling.

Using the actual gallons used / miles I average about 9 mpg. Generally travel around 60.

Gordon and Janet
Tour 42QD/inTech Stacker
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