6.7 L Fuel economy - Page 7 - Dodge Cummins Diesel Forum
4th Gen Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine, Transmission, etc...NO ADVERTISING

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post #73 of 105 (permalink) Old 04-12-2019, 01:15 PM
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You guys have some pretty impressive mpg numbers. My best tank ever was 18.3, that was a completely stock mega cab auto truck. Most of my straight highway driving seems to come in around 17.5 average and around town (rural) I'm at about 15.5 average. Now my unloaded highway driving is keeping up with traffic so 75~80 most of the way. I'm sure I could get better if I was doing 60 but I would get run off the road at that speed.


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2016 Ram 2500 Big Horn Mega cab, 285/75-18 (35's) Nitto Ridge Grapplers. Fuel Hostage III 18x9 +18 BS Wheels. Bilstein 2.3″ Front Lift, 1" rear spacer.

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post #74 of 105 (permalink) Old 04-12-2019, 02:00 PM
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Iíd be interested to hear how your trip goes. Enjoy it, these thing are even better drives when you donít have to worry about the extension behind you.
Thanks, Walker. It'll be strange not towing anything, but I'm not worried about the extension behind me - it's the slow people ahead of me that worry me.

Maybe that's one reason my mileage isn't the best?

Maybe if we start telling people that the brain is an app, they will start using it?

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post #75 of 105 (permalink) Old 04-12-2019, 02:44 PM
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I’d be interested to hear how your trip goes. Enjoy it, these thing are even better drives when you don’t have to worry about the extension behind you.
Thanks, Walker. It'll be strange not towing anything, but I'm not worried about the extension behind me - it's the slow people ahead of me that worry me.

Maybe that's one reason my mileage isn't the best?
Haha, could be.

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post #76 of 105 (permalink) Old 04-12-2019, 08:50 PM
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2018 6 SPD manual. Empty, lugging the engine, I can push 24-25 mpg. I've got the 3.40 hwy gears. Driving my style empty I get 17-18. I typically pull 15k-17k behind me, 90k miles in the last 7/8 mos. Mileage is directly related to time since my last fuel filter changes and wind direction/speed. When towing 17k at 75mph in light wind, no matter hills/mtn/ flat I get @9mpg. When my fuel filter life gets below 40%, it drops @ 1 to 1.5 mpg lower. I change my oil/filter and fuel filter element every 2 weeks and my fuel filter canister every month.
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post #77 of 105 (permalink) Old 04-19-2019, 09:26 AM
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Under 2000 miles on my new 2500, but so far averaging 18.5 mpg hand calculated, mix of Hwy and city. Computer shows 20.1mpg. Truck has the 20 in rims from the factory.
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post #78 of 105 (permalink) Old 04-19-2019, 05:00 PM
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Under 2000 miles on my new 2500, but so far averaging 18.5 mpg hand calculated, mix of Hwy and city. Computer shows 20.1mpg. Truck has the 20 in rims from the factory.

Yep, if I had a newer Ram/Cummins I wouldn't delete anything. I would just drive it and smile, but with my 2011 I have all the deletes to make decent fuel mileage, but that keeps me smiling, well most of the time.
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post #79 of 105 (permalink) Old 04-21-2019, 02:35 PM
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2017 3500 srw, 68rfe..

18-19 hand calculated pretty consistently, not towing anything. I live just off of the interstate -very little stop and go

Evic usually shows 19 -20.5

And not sure if it makes a difference, but basically at sea level
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post #80 of 105 (permalink) Old 04-22-2019, 08:29 PM
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Changed out tires, but was averaging 16.1 hand calculated through the winter on 35x12.5x18s. Now I have lighter AT tires that are proving better mpg. Looking forward to new higher numbers but am not complaining with 16.1 average.
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post #81 of 105 (permalink) Old 04-23-2019, 08:19 AM
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Good point about the tires.

The Goodyear Duratracs I'm currently running dropped the towing mileage about 8% (10.0 to 10.8mpg, non-towing about 4%(18.5 to 17.7mpg), compared to the OEM Firestone Transforce ATs.

Those numbers are corrected for the 5% optimistic EVIC.

Dunno about the weight difference (same size tires), but the Duratracs are winter rated with a soft sidewall and tread that make's it almost a mud tire. Not the best for mileage, or for towing. But they were good on the 1000 miles of mud/dirt roads we towed last summer up in the Yukon/Alaska/NWT.


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post #82 of 105 (permalink) Old 04-23-2019, 10:03 AM
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Dunno about the weight difference (same size tires), but the Duratracs are winter rated with a soft sidewall and tread that make's it almost a mud tire. Not the best for mileage, or for towing. But they were good on the 1000 miles of mud/dirt roads we towed last summer up in the Yukon/Alaska/NWT.
My '02 took a hit in mileage as well when I put the Duratracs on after the regular wranglers. The local tire shop loves them. I'm going with Toyo AT's as I don't need that aggressive of a tire and the duratracs are only ok as a winter tire IMO. Where in the NWT did you go?

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post #83 of 105 (permalink) Old 04-23-2019, 12:36 PM
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May get to Yellowknife next time.
But the trailer is still recovering from the trip to/from Inuvik on the Dempster Hwy.
Parked the trailer in Inuvik and made a day-trip to Tuk. Kayaked out to the pingos.
Froze our butts off. But we had fun and the territory is just awesome ... in the summer.
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post #84 of 105 (permalink) Old 04-23-2019, 01:50 PM
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May get to Yellowknife next time.
But the trailer is still recovering from the trip to/from Inuvik on the Dempster Hwy.
Parked the trailer in Inuvik and made a day-trip to Tuk. Kayaked out to the pingos.
Froze our butts off. But we had fun and the territory is just awesome ... in the summer.
Travel trailer down the Dempster? Brave man. I take mine as far as the Tombstones in the fall. 2nd Season on Duratracs. I like them better than the Michelins MS2s for wear and obviously traction in snow. Cooper LTX on the radar next time.
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