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Old 04-06-2015, 11:24 AM   #1
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Diesel Mileage

I recently pulled a new F.R. Sierra 377FLIK with a 2012 Ram 3500 dually diesel 4x4. It has the 6.7 motor with a 3.73 rear end. Used the Andersen fifth wheel hitch, it worked great pulling the 13000 lbs. plus, trailer and load. The truck pulled great, everything went well. Except, I'm a little disappointed in the mileage I got from the trip. We traveled about 160 miles, and the truck averaged a little over 10 miles per gallon. When I travel without the trailer, I'm getting 13.5 miles per gallon on the highway. Is this the mileage that I can expect from this diesel? Is there anything I can do to increase my mileage results? I will admit, during this trip, a couple of times I pushed the throttle up to 80 mph to get by slower truckers. I'm sure that didn't help. But anyway, does anyone have any suggestions?
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Old 04-06-2015, 11:31 AM   #2
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I have a 2012 Ram 3500 Dually 4x4 with 4.10 gears. I have 36,000-ish miles on the truck with 12,000+- of them being towing miles. My fifth wheel seems to be similarly sized- 42', 13' 4" tall, and weighing in around 14,000-14,500 pounds.

Your numbers are pretty close to the numbers that I tend to get. I hand calculate almost every tank (there's an app for that). When I'm estimating trip costs/budget, I plan for 9 mpg towing. My non-towing numbers range from 12-15 (though, 15 is rare) mpg depending on the kind of driving I'm doing (highway vs. around town).

I keep hearing that diesels get better mileage as they break in. It's gotten slightly better, but still lower than I'd like. I haven't played around with any ways to increase it.
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Old 04-06-2015, 11:37 AM   #3
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I believe that any of the big three diesels will perform about the same. I average around 10 towing and 13-14 empty with my Ford.
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Old 04-06-2015, 11:44 AM   #4
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Tuned and modded 08 duramax.
9-10 towing 14,000 lbs.
11-12 towing 7,000 lbs
19-20 not towing

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Old 04-06-2015, 12:00 PM   #5
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I just came down this winter from Upper Michigan to Arizona. I pulled a Wildcat 327ck that loaded is about 12,000lb with a GMC 2500 Duramax. Without the RV it gets 20-22 mpg and with the 5er I got 8-11 mpg coming down. In the stormy, windy winter travel the best I could get was 8-9mpg using a winter blend fuel. Along the way in New Mexico the mileage jumped up to 11mpg but it may have been because of the different blend fuel. My dream is 9-12 mpg when the D-max is broke in.
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Old 04-06-2015, 12:04 PM   #6
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[QUOTE=TURBS;827686]Tuned and modded 08 duramax.
9-10 towing 14,000 lbs.
11-12 towing 7,000 lbs
19-20 not towing

My numbers are almost exact to Turbs,
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Old 04-06-2015, 02:30 PM   #7
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Tuned and modded 6.7 Cummins, 20-25 highway, 14 towing (summer fuel), 10 fully loaded to Daytona with (winter fuel additive).

If you are up north, the additive they put in the diesel to prevent gelling, will drop your mpg 2-4/gallon. I notice this even more with the car TDI.

I agree that a diesel does not really break in until you hit 100,000 miles and your mpg will get better .
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Old 04-06-2015, 02:46 PM   #8
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Mine is a 2007 Duramax tuned with EFI Live. I have a 8" lift with 36" tires. The heaviest I have towed is 8000#'s. I get 10mpg towing. Empty hwy I get 17-20, depending on the terrain. Around town I get 14-15.

I am guessing if you tuned yours and got rid of the DPF and EGR, your numbers would really increase. That is, if you can get away with it.
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Old 04-06-2015, 02:47 PM   #9
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Op is in mo. So shouldn't be a problem

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Old 04-06-2015, 02:50 PM   #10
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Quote:
Originally Posted by Krawler View Post
Tuned and modded 6.7 Cummins, 20-25 highway, 14 towing (summer fuel), 10 fully loaded to Daytona with (winter fuel additive).

If you are up north, the additive they put in the diesel to prevent gelling, will drop your mpg 2-4/gallon. I notice this even more with the car TDI.

I agree that a diesel does not really break in until you hit 100,000 miles and your mpg will get better .

My numbers are identical. No worries of fuel additives down here in the south.
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