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6.7 fuel mileage ?

 
  #1  
Old 11-23-2018, 08:19 AM
Tonywz
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6.7 fuel mileage ?

First off, I have the 2017 F-250 CC 6.7 PS. I have been told that the fuel mileage will get better after break in period, never sure that was true. So just wondering if you all with the newer 6.7, did your fuel mileage get any better and about at what mileage did you notice any change? Thanks.
 
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Old 11-23-2018, 08:30 AM
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I personally didnít see a change in my 2017 6.7 SRW CC Platinum. In the city, the truck calculates 16.3 mpg. Hand calculating fuel mileage, I am showing closed to 15.3. I havenít had much opportunity to take it out on the highway, but I see around 19-21.

Of note, this is while NOT towing.
 
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Old 11-23-2018, 08:54 AM
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'17 450--mileage has not increased from 170miles to 44000 miles when not towing----14.0--15.0 on the dash calculator. I think all the new diesels pretty much are 'broke in' already due to better mfg tolerances.
 
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Old 11-23-2018, 09:05 AM
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I get in the 15s for mostly city driving. Highway mileage is better, especially if I can keep the speed down. 80mph cruise with CC nets in the high 16s.

I bought my truck, new, in the fall and assumed that the increase in mileage I noted at about 7K miles was due to switching from winter to summer blend fuel.
 
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Old 11-23-2018, 09:08 AM
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That's an old wives tale from back when engines didn't have as close of tolerances in the machining. The new engines have very little break in.
My 2011 went 150,000 miles before I sold it.
My 2015 went 90,000
My 2017 is now at 35,000 miles and I have not seen the mileage improve in any of those three trucks.

Don't hold your breath waiting for mileage improvements
 
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Old 11-23-2018, 09:15 AM
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That is largely a long-running myth. The point of highest friction in the engine is from the piston rings. This is from both ring tension and surface area. The surface area never changes. Tension is lost over time, but the "time" is the useful life of the engine so once tension deteriorates, ring seal does too. Time for an overhaul.

Engine bearings do not break in. The hydrodynamic oil wedge keeps the rod and crank bearings from contact with the crankshaft. It should go without saying that if your bearing are "breaking in" your engine isn't long for this world. The best outcome when it comes to bearings is upon tear down of a high-mileage engine, the bearings look brand new.

There is a very slight friction reduction as the transmission and differential gears develop their wear pattern but you'd probably need scientific laboratory controlled methods to measure the tiny fractional difference in fuel use.

The best way to manage fuel economy is through the disciplined application of foot pressure on the skinny pedal. It has always been this way.

You see threads here all the time with folks inquiring about what others achieve for fuel economy. It's useless information. If you're not following directly behind them on the drive, your fuel economy will be different. Guaranteed.
 
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Old 11-23-2018, 09:41 AM
eryoung
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I'm getting in the 14's mpg in the city, I can get 17-18 on the highway keeping it at the speed limit (not towing). which is very difficult!! Bo likes to run and stretch his legs on the highway!! LOL Only got 10k miles on mine
 
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Old 11-23-2018, 10:06 AM
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On my ‘18 350 city 15 to 16, highway 18 to 19. When it goes into regen (about once/500 miles) highway mpg drops to 12 to 13. Running a useful app tracks fuel and maintenance costs, tracks mpg’s too. Simply Auto
 
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Old 11-23-2018, 01:31 PM
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I'm seeing 15.6 for an average of city/highway driving. Freeway speeds for me are 75-80 so I will likely never see the 19+ others report. My speedo is off by about 10% based on my good friend's State Trooper radar check. Hand calculated one tank of mixed driving and adding the 10% is around 14.5 if I recall. I need to check it on a longer trip and see what it does.
Never saw it in my Duramax over 13 years either and it was heavily modded. One of the funniest mpg stories I ever heard was a buddy who had cummins dodge that got 26mpg per him. On a trip from KC out to Western Colorado he was buying fuel every time I was when I was getting 16-17 mpg in my old Duramax that had the 26 gallon tank. On the third fuel stop I walked over and asked him how much fuel his truck would hold as doing some simple math he was either pumping it on the ground or into a can. The look on his face was priceless. Moral of the story is I'd love for my truck to get 20 mpg but I didnt buy it for fuel economy. I bought it to use and I love driving it. 20mpg would be an incredible bonus benefit for sure. Maybe once I get older and slow down I might see those numbers or my eyes will be bad enough I can claim it with a straight face.
 
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Old 11-23-2018, 02:50 PM
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I pick up my Ď19 F250, 6.7 CC LB SRW tomorrow. Currently I have an Ď08 Chevy K2500 6.6 CC SB SRW. On Thanksgiving I drove from Houston to Dallas and got 21 mpg at 77 mph. The Chevy has 270K mikes on it.

I hooe one I can equal that with my F250.


8654
 
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Old 11-23-2018, 04:07 PM
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Originally Posted by 8654 View Post
I pick up my Ď19 F250, 6.7 CC LB SRW tomorrow. Currently I have an Ď08 Chevy K2500 6.6 CC SB SRW. On Thanksgiving I drove from Houston to Dallas and got 21 mpg at 77 mph. The Chevy has 270K mikes on it.

I hooe one I can equal that with my F250.


8654
Not a chance you will get 21 mph, 18-19 is realistic though.
 
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Old 11-23-2018, 04:07 PM
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i get what ever my foot will let me. around 16
 
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Old 11-23-2018, 04:56 PM
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I'm happy to get 15-17 on the highway. Dually crew cab. Ok, well not happy, but it is what it is.
 
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Old 11-24-2018, 12:06 AM
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Surprised to see such low numbers for the 6.7's. My gasser comes in about 1-2 miles behind some of these figures. I am only towing 8000lbs though......
 
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Old 11-24-2018, 09:46 AM
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Just took a vacation to Gatlinburg TN from WV.
This was my avg. mpg across I81- roughly 100 miles of data. For those not familiar with this stretch, it's mostly flat with rolling hills.
From our house to I81, we travel I77 through the WV turnpike. That's much more of a mess for mpg as it's up and down constantly. From our house to I81, mpg was mid 18's with one regen.
Best mpg I've seen was a trip to Louisville KY down I64. Just about flat. Running 72 mph on cruise avg. was 21.
I have no reason to distort any of this as I didn't buy it for mpg. But I'm totally happy with mileage. Local daily driving returns mid 16's.
Truck is a 2018 F250 crew FX4 Lariat Ultimate. Factory 20's and 3.55's. Only mod is a leveling kit. Just turned 5k.
 

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