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6.7L Power Stroke Engine and Drivetrain Discussion of the 6.7L Power Stroke diesel engine and drivetrain in the 2011-Up Super Duty trucks. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 6.7L Power Stroke engine.

Thread: '2016 mpg at 36k miles? Reply to Thread
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  Topic Review (Newest First)
10-07-2018 03:53 PM
MasterChief My personal opinion (worth the weight of popcorn) is that at 36k, you're just starting to get broken in.
As others have said driving conditions, gear ratio, fuel quality (cetane regs are a joke), additive effectiveness (I use OptiLube xpd and boost religiously), tire pressure, tire brand/size differentials, regen frequency, etc etc ALL factor into what you should "expect" as far as MPG goes.

I average about 19.5-20 going to work (coming down from the hills about 3000 feet) and 17-18 going home.

I have kept every single fuel receipt since I picked it up from the dealer, and the receipt math is what I'm quoting not the dashboard display - which can differ as much as 3mpg per tank.

Enjoy it, drive it more, and you'll eventually settle into your normal fuel usage. I don't think I saw near 20 until about 50k.
09-25-2018 01:36 PM
RTSmith What about oil? I understand my '16 F-350 came factory fill with the 10W30 that the manuel suggests for most usages. Dealer changed oil, went with the 15-40. Mileage dropped it seemed. Have since gone back to the 10W30.

Aside note- new CAT compact track loader runs 10W30 in a synthetic oil. Reckon the old days of 15W40 for all diesels may be fading into the past.
09-24-2018 11:12 AM
JESSE 1 I reset my trip odometer when the truck goes into regen. Completes in about 16 miles. Almost like clockwork my truck will go into a regen at around 400 miles. When it's getting close in miles I will take a longer route to allow the regen to complete. I have used Motorcraft PM22 with every fill-up.
09-23-2018 09:34 AM
rmr I think rolling resistance is a big factor. I had a set of Les Scwab's once that felt like I was driving in wet cement . But Michelins are usually good MPG tires so I dunno?
08-06-2018 08:17 PM
Originally Posted by gearhead1011 View Post
Without correcting the odometer for the tire size change the mileage wouldn't change due to gear ratio. The truck still thinks it's travelling the same distance with both sets of tires according to the odometer.
Going with larger tires would make the computer think it is going a mile shorter than it actually did.
So in theory it should show less mpg than it accutally has.
08-06-2018 01:35 PM
gearhead1011 Without correcting the odometer for the tire size change the mileage wouldn't change due to gear ratio. The truck still thinks it's travelling the same distance with both sets of tires according to the odometer.
08-04-2018 08:50 AM
larrgh On a 8,500 pound (4 ton) truck, adding the weight of the larger tires is not going to affect the mileage as much, it any, as it would on a 3,000 pound car/truck. It might in fact increase mileage.

It would be interesting to know the difference in weight of the two sizes. I bet the weight is less than 125 pounds total for all 4. I would think even less, maybe 75 pounds. So, how much weight is being added compared to the total truck weight? hummmm....less than 1%?
08-03-2018 08:29 AM
Capp35 All true, but also in theory the larger/wider tire is heavier and has more rolling resistance. Which should in turn affect/worsen mileage.
08-02-2018 09:45 PM
larrgh The larger tires would in theory make the ratio a smaller number, i.e., 3.25 or 3.31 or similar. The engine turns less RPM to maintain the same speed.

The smaller the ratio number, the more the gear is designed for fuel mileage. The higher the number, the more it designed for torque and pulling.
08-02-2018 08:00 PM
Capp35 Just an update on the mileage.
I just recently bought a set of Cooper Tires in 295/70/18. These are taller and wider than the stock Michelin‘s that were on there. But I’m consistently (2nd tank) getting about 2 miles to the gallon more. Go figure?
I assume since I have the 3.55 rear gear that it is raising the gear ratio and causing better mileage?
I have gone from 14 to 16 mpg on the computer and it should be reading opposite with the larger tires fooling the speedo.
As soon as I am on empty on this tank, I will take hand calculations.
According to my GPS there’s only a 1 mile an hour difference, being faster than the speedo.
07-18-2018 09:55 PM
larrgh I use the Stanadyne. I does not emulsify the water and try to pass it through the fuel filters for it to be burned in the engine.
07-18-2018 09:15 PM
Originally Posted by badbart View Post
Maybe it's that new math.....
THIS!!! As I said, I really don't think you're that far off on your mileage. And for terrain like you drive (same for me), cruise control is absolutely your friend. It will hold the speed much better than a human foot could do. I would tend to agree in a hill area, but not on relatively flat roads.
07-18-2018 02:19 PM
gearhead1011 One thing not mentioned in this thread is the fuel. I have seen a significant difference in fuel economy with the quality of the fuel you run. This is true with diesel and gasoline. That said I get around 12 -13 with mine with my average use which sees a combination of stop and go, a little highway and towing. Empty truck with no trailer and strictly highway driving will get right at 20.
07-18-2018 11:01 AM
Originally Posted by 2015_PSD View Post
I do use Diesel Kleen, Howe's, or Stanadyne in every tank for water control.
Willing to give one of these a try.
Looking at pricing, Diesel Kleen and Howe’s are the most economical, but the Howes adds ant-gel which is not needed here.
Which would just be good for water and possible fuel mileage increases? I see the DK also has cetane booster, not sure about Howe’s.
07-18-2018 10:27 AM
Capp35 I picked up my truck yesterday, and got a new battery under warranty. While it was there they checked and found no codes. They also did what they call a multi point diesel inspection and everything was fine.
The dealer also told me to make sure my Regen was completely before turning the truck off. That it would try tokeep doing it every time the truck was started, until it was complete and this would affect mileage greatly.
How do you know when it has finished? My truck will have the red/orange pop up saying that it has been initiated but turns off after about a minute. Supposedly it takes 30 minutes? Five days a week I never drive over 30 to 40 minutes at a time.
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