'2016 mpg at 36k miles? - Page 2 - Diesel Forum - TheDieselStop.com
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.

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post #16 of 27 (permalink) Old 07-18-2018, 09:15 PM
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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.

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post #17 of 27 (permalink) Old 07-18-2018, 09:55 PM
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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.
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2015 F350 Ultra Lariat 6.7L CCLB DRW 3.73 Limited Slip, Green Gem Metallic w/ Caribou accent, Camper Package, Titan 65gal tank, Rapid Heat, Block Heater, Upfitter Switches, Dual Alternators, Camper Package, Cable Lock, Husky Floor Liners, Spray in Bedliner, 5th Wheel Prep, 25K 5th Wheel Hitch, Ford Goose Neck Hitch.

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post #18 of 27 (permalink) Old 08-02-2018, 08:00 PM Thread Starter
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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.

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post #19 of 27 (permalink) Old 08-02-2018, 09:45 PM
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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.
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2015 F350 Ultra Lariat 6.7L CCLB DRW 3.73 Limited Slip, Green Gem Metallic w/ Caribou accent, Camper Package, Titan 65gal tank, Rapid Heat, Block Heater, Upfitter Switches, Dual Alternators, Camper Package, Cable Lock, Husky Floor Liners, Spray in Bedliner, 5th Wheel Prep, 25K 5th Wheel Hitch, Ford Goose Neck Hitch.

Traded 2011 F350 XLT CCLB SRW 6.2L gasser 6,000 miles for 2015

Sold 1996 F350 XLT CCLB DRW 7.3L 208,000 miles



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post #20 of 27 (permalink) Old 08-03-2018, 08:29 AM Thread Starter
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All true, but also in theory the larger/wider tire is heavier and has more rolling resistance. Which should in turn affect/worsen mileage.

SOLD: 99 F250 Lariat, PSD(XLE4), CC, SB, Woodland green, 4X4, WD chip, A pillar & gauges, Ranch Hand bumper replacements, Black diamond tool box, Husky floor liners, Jackit level kit, Rancho 9000's, Rancho 5404 steering stabilizer, BFG 285's AT,
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post #21 of 27 (permalink) Old 08-04-2018, 08:50 AM
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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%?
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2015 F350 Ultra Lariat 6.7L CCLB DRW 3.73 Limited Slip, Green Gem Metallic w/ Caribou accent, Camper Package, Titan 65gal tank, Rapid Heat, Block Heater, Upfitter Switches, Dual Alternators, Camper Package, Cable Lock, Husky Floor Liners, Spray in Bedliner, 5th Wheel Prep, 25K 5th Wheel Hitch, Ford Goose Neck Hitch.

Traded 2011 F350 XLT CCLB SRW 6.2L gasser 6,000 miles for 2015

Sold 1996 F350 XLT CCLB DRW 7.3L 208,000 miles




Last edited by larrgh; 08-04-2018 at 08:53 AM.
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post #22 of 27 (permalink) Old 08-06-2018, 01:35 PM
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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.

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post #23 of 27 (permalink) Old 08-06-2018, 08:17 PM Thread Starter
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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.
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post #24 of 27 (permalink) Old 09-23-2018, 09:34 AM
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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?

1986 F250,Regular cab,XL,4X4,6.9, 4 speed,
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post #25 of 27 (permalink) Old 09-24-2018, 11:12 AM
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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.

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post #26 of 27 (permalink) Old 09-25-2018, 01:36 PM
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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.
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post #27 of 27 (permalink) Old 10-07-2018, 03:53 PM
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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.
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