Hand.

Highly dought all you want. My prior 2012 6.2 with 3.73 gears and 212,000+ miles of me driving it did about the same.

I set cruise 4 over posted speed and enjoy the drive. Hammer down only to pass then cruise set again.

 

There are obviously many factors that affect fuel mileage but my experience is very similar to what Scraprat is reporting. With my 6.2L and 4.30 gears running 65-75 I consistently see between 14-15 over a variety of terrain - hand calculated as shown by my fuelly.com entries from an unloaded trip I made from the Seattle area to Arizona and back. Overall average for the whole trip was 14.95 with a best tank of 16.7. All city driving I'm definitely in the ~10-11 range.

 

You can easily get mid to high teens with these trucks if you're mainly (90% or more) driving highway. Stop and go, in town, Hello single digits.

 

2022 F350 DRW 3.73 13.5mpg 65-70 12mpg city
2022 F350 DRW 4.30 13mpg 65-70 12mpg city

The truck with 4.30 gears is slightly lighter cause it has a couple fewer options but maybe 100lbs difference between trucks. Both dual alternators.

 

Would love to know how you're getting those MPG in city with 6 wheels when I'm not even seeing that with 4 wheels with my 4.30. Does your "city" driving include stop and go and plenty of idle times?

 

Depending on weather if my wife sits in the truck while I go to Walmart or somewhere it will idle but that is an entire tank driving around Chattanooga in either truck hand calculated. Ive never been able to get over 13 or 13.5 for an entire tank on the highway in either truck.
I drive in the city like there's an egg under the pedal and coast to a stop a lot.

 

I'm not quite that easy on mine but I'm far from aggressive in town, I'm certainly not racing light to light. Mine also has only about 3k miles on it, so perhaps when I get a few more miles it'll go up some, but definitely won't be a 3-4 MPG increase . Luckily I don't put many miles on my truck so MPG isn't as big of a concern as it is to many.

 

I'm getting the same as OBS460 in mine and drive the same way. I do use eco mode most of the time however. My commute to work is rural 2 lane roads with a few stops and turns. My 17 6.2/4.30 did a bit better empty on the same commute (14.5) and 16/17 on the freeway was easy to get. Doubt I'll see more than 14 in the dually. No complaints tho.

 

I do use Eco mode in city driving but not on the highway because it doesn't get any better mileage on the highway and the pedal response is more laggy from my experience in both of these trucks.

 

I get about 1 mpg better than all of Scraprats numbers with my 7.3 3.73 truck consistently. I have randomly sampled tanks and never found my "lie-o-meter" to be more than 3 tenths of an mpg off hand calculated.

Previously, no, gas trucks didn't do very well but my 7.3 gets 3-4 mpg better than my 6.2 6 speed 3.73 steel body truck did. I am only 1-2 mpg behind my buddies with diesels running the same program.

 

Maybe having the cap on and always running with 1,200# plus of weight in the bed could be some of the difference but still gets pretty good mileage for a brick.

 

I had a 2020 F250 XLT, CCSB, 7.3/3.55. I know have a 2022 F350 King Ranch, CCSB, 7.3/4.30. Both have/had Ranchhand replacement bumpers and a folding hard tonneau covers. I had the 3.55 truck for about 7k miles and have about that on the 4.30 now. My casual observation indicates about 1 MPG difference in highway driving. Overall average seems closer. I don't keep records in it or hand calculate, but check the truck display at times. Hope that helps someone.

 

Hard to know, mine isn't exactly set up as a mileage champ. I have bigger aggressive tires that I run low pressure in, short front valance, a fair amount of 4wd use etc. Probably 300 lbs in the tool box, open short bed.

Mostly it is the high elevation mountains. Always has seemed to increase my vehicles mpg by 1-2. On my long trip empty we did 15.5 running 80-85 for 5500 miles. I also think working it early on helps. I had a 12k load behind it by 2000 miles for a road trip including a solid 45 minute climb up Monarch pass followed by lots of engine braking down the other side. I think it contributes to good ring seal and efficiency. I don't think gentle break ins are a great idea myself.

 

I usually have a few hundred pounds in the bed even without hauling anything. I stay in the right lanes most of the time doing 70 or under. 17-18 mpg is not unusual.


I see diesel people bragging their PSD gets 18-19mpg on the highway empty and I just chuckle to myself, I don’t argue with them anymore.

 

You are a better man than me, I tend to have an overwhelming urge to burst out laughing at them...