Gas Mileage
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3rd Gear
Joined: May 2022
Posts: 3
Likes: 1
From: Houston
Gas Mileage
I need to get myself another F-250 and I'm wondering if there is a noticeable difference in the fuel mileage between the 2020+ 6.7L with the 10 speed trans. and the older 6 speed transmissions?
Logistics Pro
Joined: Aug 2006
Posts: 4,477
Likes: 4,069
From: Raceland, La.
One of my son in laws has a '17 F250 with the 6.7 and a 6 speed. He gets up to 23 mpg at 60 mph and 17 in daily driving. Not bad but the 10 speeds will do better. Also the driving conditions and gear ratio has a lot to do with it. I had a '17 F350 dually with the 6.7 and 4.10 gearing and the 6 speed. It would get 15 to 16 mpg in my daily driving but only 16 to 17 mpg hwy depending on conditions and speed.
FTE Legend
Joined: Mar 2017
Posts: 31,891
Likes: 9,176
From: Western NY
I just helped out my buddy recently and delivered some patio furniture to Penfield, NY. I probably did about 180 miles round trip and started with a full tank. The I-90 eastbound past Buffalo is fairly just level driving with a few spots having hills; that also includes some city driving as well. I kept it on cruise at 65 mph and refilled when I got back to the Buffalo area. I got 20.4 mpg hand calculated. I have the 3.55s. I have seen 18ish on my road trips to KY but Kentucky is very hilly. I was at 65 to 75 on those trips. Now daily driving my truck, I've slowed down some on the expressway where it's 65 mph, I usually do 58 mph or so, add in the hills I climb go to and then coming back home with a little city driving, I'm at 15.5 to 16.5 mph being easy on the throttle.
Like has been said, with the extra 4 gears in the 10R140, there has to be more miles to the gallon by keeping the engine in the powerband and dropping less RPMs.
Like has been said, with the extra 4 gears in the 10R140, there has to be more miles to the gallon by keeping the engine in the powerband and dropping less RPMs.
Tuned
Joined: May 2006
Posts: 304
Likes: 77
From: St Paul MN
We use a 6 speed 2017 F550 and a 10 speed 2020 F550 for hauling.
Can confirm, 8 to 9 mpg verse 9 to 10 mpg.
Also more torque off the start line with the 10 speed.
The guys take the 10 speed out if they are both sitting in the yard.
Absolutely nothing wrong with the 6 speed and the 6.7.
Both of them pull 40,000 pounds gcwr down the road just fine.
Can confirm, 8 to 9 mpg verse 9 to 10 mpg.
Also more torque off the start line with the 10 speed.
The guys take the 10 speed out if they are both sitting in the yard.
Absolutely nothing wrong with the 6 speed and the 6.7.
Both of them pull 40,000 pounds gcwr down the road just fine.
Laughing Gas
Joined: Feb 2007
Posts: 769
Likes: 156
If mpg is a big deal then get a 4 cylinder or electric car. 1-2 mpg improvement is insignificant and within the margin of error of measuring.
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4wd Low
Joined: Nov 2004
Posts: 13
Likes: 15
My 2016 averaged 18-19 on the freeway at 70-75 with light winds. My 2020 with the 10 speed was aways 20-21. Both F350 CC 4X4's with SRW axles. Pretty sure the 2016 had 3.55's and the 2020 definitely had 3.31's.
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Cross-Country
Joined: Jan 2003
Posts: 83
Likes: 0
From: Lafayette, La
My 2017 gets 14.5 (hand calc 15). I drive 750 miles to work at 75 mph usually. It got 16 till about 60,000 miles then dropped off. My 7.3 increased 2 mpg at 60000 miles. I love the truck but for a diesel the mileage blows. I ask everyone I see with a 2020+ and they say 19-21 mpg.
Lead Driver
Joined: Nov 2005
Posts: 5,229
Likes: 4,245
From: Kaysville Utah
I put 150,000 miles on a 2011, 100,000 on a 2015, 90,000 on a 2017 All 6.7L 3.55 SRW trucks
I currently have a 2020 configured the same and I get .5 to 1.0 mpg better when towing my 13,000 lbs GN Horse trailer and 1-2 mpg better empty hiway
I currently have a 2020 configured the same and I get .5 to 1.0 mpg better when towing my 13,000 lbs GN Horse trailer and 1-2 mpg better empty hiway
8th Gear
Joined: Nov 2021
Posts: 8
Likes: 0
We use a 6 speed 2017 F550 and a 10 speed 2020 F550 for hauling.
Can confirm, 8 to 9 mpg verse 9 to 10 mpg.
Also more torque off the start line with the 10 speed.
The guys take the 10 speed out if they are both sitting in the yard.
Absolutely nothing wrong with the 6 speed and the 6.7.
Both of them pull 40,000 pounds gcwr down the road just fine.
Can confirm, 8 to 9 mpg verse 9 to 10 mpg.
Also more torque off the start line with the 10 speed.
The guys take the 10 speed out if they are both sitting in the yard.
Absolutely nothing wrong with the 6 speed and the 6.7.
Both of them pull 40,000 pounds gcwr down the road just fine.
I am getting ~12 mpg highway unloaded (800lb flatbed) with my 2022 F550 7.3
More Turbo
Joined: Feb 2011
Posts: 708
Likes: 188
I came from a 2015 Lariat Supercrew 4x4 with 3.31s Ecoboost to a 2021 F350 6.7 4x4 with 3.55s. I get better daily avg mileage, better towing, better hwy. I have never had a hwy trip under 20 mpg but I don’t drive faster than 75 mph often. I drive faster towing but still get better towing mpg.
But for the right price, I’m sure the older 6.7s will get good mileage. Just my 2 cents.
Tuned
Joined: May 2006
Posts: 304
Likes: 77
From: St Paul MN
The 2017 6 speed tranny doesn't ever hit over 10 that I am aware of.
We are only unloaded on the way back from job sites (we wouldn't run the truck unloaded).
The 2020 weighs 10,500 curb without anything on it, single cab with a 16' aluminum flat bed.
Might try the big gasser someday, but I wouldn't expect to get the life out of it that a diesel is able to give. I have heard good things about the 7.3.
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