The fuelly.com average MPG for 2011-2016 6.7 Cummins seems to hover right around 16 MPG.Today the wife and I spent most of the day running some errands with our new 2016 6.7 3500 SRW. Put about 125 miles on the truck (odo says 660 total miles). About 50 percent was interstate at 65 MPH, the remaining miles were driven at 40-45 MPH on secondary roads with stop signs and lights about every mile or two. Filled up the truck just before we started and reset the EVIC. Filled it up at the same pump when we finished.EVIC showed 21.9 MPG. Hand calculated at 20.5 MPG. Average speed was approx. 38 MPH.After the first 30 or 40 miles today, I couldn't help but notice the EVIC hovering around 21 MPG. Just for the heck of it I kept driving conservative just to see what was possible. This is a very pleasant surprise. I honestly expected to get around 13-15 MPG until this thing got broken-in.

our 04.5 duramax at best did 17 maybe 18 on the highway. Or 2015 denali, 600lbs heavier, does 18-19 consistently, best was 24.5 running about 62 empty when DW was driving the denali and I was driving a uhaul. we won't talk about what the uhaul truck got.!!drive conservatively on the highway and I think you'll end up over 20.In town and towing, didn't see much difference compared to the 04. twice going from portland to san diego on I-5 we managed over 20 hand calculated. newer trucks, considering the huge frontal area, high Cd, and heavy weight do darn good IMHO. In terms of "ton miles/gallon" they are better than most econoboxes.

A couple of times I reset the MPG average on my Cummins while driving at approx. 60 MPH (cruise control on) for a few miles. Got very similar results as you did, approx. 25 MPG (based on an overly optimistic 27 MPG on the EVIC). Simply amazing these heavy trucks (from the Big 3) can get this kind of mileage. From all indications I'm getting 15 percent better mileage than I did with my Tundra 5.7 V8, at least when empty. I've yet to tow anything.

Good mileage.......but not real surprised given the lower speeds.My old 2007 5.9L 7900# gets 17 mpg (hand cal) when I keep it under 65.Step it up to 70 and it drops to 14 mpgCourse hook it up to the 5vr and it's 10 mpg 22,000# comboCheck it again same type of speeds at 30,000 miles......should go up.Enjoy that truck, good choice!

Speed, acceleration, and grades are fuel economy killers. Larger and more aggressive tires do their share, also. I have done 30+ with both the EcoD and the Jeep by using cruise control at 60MPH on a clear hiway. The EcoD is going to lose a few MPG soon when I put on LT tires with a little more aggressive tread.

We got 18+ coming home for the dealer in Colorado at 80 MPH, in Western Wyoming. Chris

6.7 Cummins: 20+ MPG?! | Good Sam Community

spoon059
Explorer II
Feb 21, 2016
On the highway at 75 mph I can get almost 22. If I always drove on the highway, my average would be a lot higher. In reality I spend most of my time slowing down or speeding up and my overall average is about 16-17 mpg. Still pretty good, in my opinion.

We are 1300 miles into a 2000 mile round trip towing and averaging almost 12 towing at 68 mph with a 32 foot travel trailer. My father-in-law is towing a slightly different model, 31 foot travel trailer that is about the same weight with his Chevy 6.0 and getting about 8 on the same roads and conditions.

I'm blown away with how fuel efficient the Cummins is. If I had known, I would have gotten one years ago!!!
YnotTurbo
Explorer
Feb 21, 2016
I average 16.5 empty with my 2016 3500 dually 4x4. I do have 4:10 gearing. It is still 3 mpg better than my 2012.
wanderingbob
Explorer II
Feb 21, 2016
Twenty on my 2014 2500 is easy , towing I get 14 if I stay less than 65 MPH , 26 foot trailer .
drittal
Explorer
Feb 21, 2016
I've hand calculated my 6.4l Ram at 23.89 mpg at 50. Dash read 4mpg lower. Lol.
IdaD
Explorer
Feb 21, 2016
My EVIC has been really close every time I've checked it, at least within a half a MPG. It seems to be low as often as it's high. Certainly for my purposes it's proven to be close enough.

My lifetime average is a little over 16 but that includes towing and most of my daily driving is city. Under 65 on the highway is the sweet spot but in my part of the country I have to deal with a lot of terrain which obviously complicates things compared to most of what's east of the Rockies. Even with the terrain a long highway trip without the trailer and speeds under 65 consistently nets better than 20, but that's not how most of my miles accumulate.
N-Trouble
Explorer
Feb 21, 2016
Walaby wrote:
ShinerBock wrote:
I wouldn't trust EVIC mileage or any other manufacturers computer mileage numbers. The are notorious for being optimistic especially Ram's. My EVIC always shows 2-3 MPG greater than hand calculated numbers.

I used to think the same, but then, if you think about it, the computer probably knows EXACTLY how much gas you used, and how far you traveled. When you fill up, you may or may not top off (or the pump may or may not shut off) at the same spot.

Now, if the manufacturers "tweak" the math algorithm to show better, I guess that's a whole different thing.

On my Sierra 1500, I always checked both, but I found the computer was pretty dang close to my hand calculations. Haven't done both on my Ram yet.

When I drove my 2014 2500 Cummins home from the dealer, EVIC cleared and showed 20+MPG. Around town, Im hitting about 15. Now, in the short haul with my trailer back to the trailer dealer, I showed 10MPG.

Mike

No No No... These trucks do not have physical fuel flow meters on them. Fuel consumption numbers are strictly based on algorithms and various engine parameters. Some trucks are spot on and some are consistently off. It doesnt matter where or how I fill up my DIC ALWAYS underestimates my fuel used by 5-7% compared to pump at each fill. How and when the pump turns off is irrelevant since these algoriths have no knowledge of the fuel level in the tank. If as your saying the computer is always accurate where is that 5-7% (1-2gal) of fuel going. Last I looked I dont have a hole in my tank.
N-Trouble
Explorer
Feb 21, 2016
I love how people descibe their trucks mileage. ONE TIME driving xxMPH with no regen I got xx... ONE TIME I reset my DIC while going 55mph and got xx...

Unless your quoting numbers at each fillup or over LONG several hundres mile trips all the rest is meaningless numbers.
45Ricochet
Explorer
Feb 21, 2016
Hows your DEF consumption?
Walaby
Explorer II
Feb 21, 2016
ShinerBock wrote:
I wouldn't trust EVIC mileage or any other manufacturers computer mileage numbers. The are notorious for being optimistic especially Ram's. My EVIC always shows 2-3 MPG greater than hand calculated numbers.

I used to think the same, but then, if you think about it, the computer probably knows EXACTLY how much gas you used, and how far you traveled. When you fill up, you may or may not top off (or the pump may or may not shut off) at the same spot.

Now, if the manufacturers "tweak" the math algorithm to show better, I guess that's a whole different thing.

On my Sierra 1500, I always checked both, but I found the computer was pretty dang close to my hand calculations. Haven't done both on my Ram yet.

When I drove my 2014 2500 Cummins home from the dealer, EVIC cleared and showed 20+MPG. Around town, Im hitting about 15. Now, in the short haul with my trailer back to the trailer dealer, I showed 10MPG.

Mike
Cummins12V98
Explorer III
Feb 21, 2016
In my 11 Dually and current 15 Dually my EVIC is consistently .4mpg high compared to hand calc.

If I reset at 70 on the freeway it will show 16mpg and at 60 18mpg. Truck is a RAM Dually with 4.10's.

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6.7 Cummins: 20+ MPG?!

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