2024 2500 4x4 6.4 ,4.10 gears . gas mileage

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nlambert182

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Yes it changed in 2019. I just looked up payload charts for a 2019-2022 2500 with the 6.7 and it looks like 3.73s were the only ratio offered for any flavor 2500 with the 6.7.
 

Fatbob Frank

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How big is a hat?

It's a question without an answer unless there's more detail. With my 2021 PW, I've gotten as high as 18.X mpg, but more realistically running empty on flat highways without much wind, 16.X on summer gas and high 14s/low 15s on winter gas long term. Load it up, get a head wind, get hills, you can see single digits.
Yep similar here..
FWIW- I've never done anything to my truck that actually improves the mileage.
First thing I did was switch to a set of heavy 10ply 35" RTs.
Then added a sweet sounding exhaust...
Frankly I'm happy with my 15mpg average...but I still see 18mpg if I'm on the highway long enough...
 

2003F350

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Yep similar here..
FWIW- I've never done anything to my truck that actually improves the mileage.
First thing I did was switch to a set of heavy 10ply 35" RTs.
Then added a sweet sounding exhaust...
Frankly I'm happy with my 15mpg average...but I still see 18mpg if I'm on the highway long enough...
The ONLY things I've ever done that actually improved mileage were tunes to get rid of spark knock (on my old '98 Grand Prix GTP, supercharged 3800 - there was a spreadsheet I could run live data through that altered the fueling tables and DID improve mileage), switch all driveline fluids to synthetic...and that's it. The mileage gains due to those were minimal at best, perhaps 1-2 mpg.

Free-flowing exhaust WILL help at highway speeds somewhat, again MAYBE 1-2 mpg at best. It is offset by a reduction in mileage off the line/around town due to the lower back pressure, so unless you are primarily driving at highway speeds it probably won't net you any gains.
 

Fatbob Frank

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The ONLY things I've ever done that actually improved mileage were tunes to get rid of spark knock (on my old '98 Grand Prix GTP, supercharged 3800 - there was a spreadsheet I could run live data through that altered the fueling tables and DID improve mileage), switch all driveline fluids to synthetic...and that's it. The mileage gains due to those were minimal at best, perhaps 1-2 mpg.

Free-flowing exhaust WILL help at highway speeds somewhat, again MAYBE 1-2 mpg at best. It is offset by a reduction in mileage off the line/around town due to the lower back pressure, so unless you are primarily driving at highway speeds it probably won't net you any gains.
Gains?- No I don't think the glasspack helped mileage at all....
96754e1d2b7fc6c19adc1bcd3df87112.jpg
 

2003F350

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Gains?- No I don't think the glasspack helped mileage at all....
View attachment 558973
If you can keep your foot out of it, yes, a free-flowing exhaust DOES help mileage at highway speeds, though not by much. I'm not talking about a glasspack, I'm talking an actual exhaust system. Even so, it is offset by the loss of backpressure at low speeds, where MOST vehicles operate.

Most people won't see that improvement even at highway speeds, because they can't keep their foot out of it.
 

turkeybird56

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(I'm new, please let me know if my addition is in appropriate) Just adding for a comparison. Not the 6.4(gas) BUT I have 2017 Laramie,4x4, 2500 crew, long bed, 6.7 DIESEL ,6spd trans. with the middle differential ( I don't remember the number at this time.) 17" stock tires. I bought for towing. I keep a topper on and tools, plus, most always have some load, as it handles better with weight. ( Less traction loss). In Alaska. At 7yrs old, I get 21 hwy. 18city, no less than 14 towing. Usually top speed through mountains. I don't loose power even on steep inclines, just more fuel. The only issue I've had is when battery gets weak it had computer glitches, like, lights dimming in cab, seat heat settings wouldn't turn off. Or radio won't work without restart. Odd. So after a year of that. It just wouldn't start one morning. No click. Changed the 7yr. old dual batteries, works great again. I have not done the new recall on emissions. No trust. ( If you're going to be towing alot, or heavy, I do recommend the diesel. But have no knowledge of the newer models. Good luck with your choice.
KAYCI: Note to self: Do not go so long without changing BOTH batteries, especially in all of places, Alaska. Cause the new ones just won;t normally go 7 years. You be lucky you get 4, just saying.
__________________________________

TO THE OP: Very first poster asked: What are you going to use the truck for? That is the question. If you plan on occasional towing, not super massive weight, the 6.4 be great. If you plan on towing every day, running truck hard, pulling big loads, than consider Diesel.

But understand, a 2500 rides decent, but do not expect a Caddy type of ride. And fuel mileage has soooooo many factors involved on how the truck does. You got a lot of good comments in the previous postings.
 

olyelr

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You may not wish to be quite so strident. 2021 2500, 4x4, 6.4 gas, with 3:73 gears

View attachment 558975
You drive downhill with the wind behind your back everywhere you go ? Lol.

Obviously getting those numbers is possible, but i would guess very rare. And also, with the 6 speed its definitely worse. Ive had my 6.4/6speed for 125k miles now and have never averaged more than 13.4 mpg when just cruising empty…and its usually much less.
 

2003F350

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You drive downhill with the wind behind your back everywhere you go ? Lol.

Obviously getting those numbers is possible, but i would guess very rare. And also, with the 6 speed its definitely worse. Ive had my 6.4/6speed for 125k miles now and have never averaged more than 13.4 mpg when just cruising empty…and its usually much less.
Again, depends on what your driving style and speed is.

My '17 PW averaged about 16 summer, 14 winter. But the VAST majority of my driving was on rural highways, posted at 55 mph so I was running about 57. When I got on the expressway at 70, I'd get 13 or so. Up north where it is 75, I'd get about 12 IIRC, I didn't drive up there much without a trailer so I was always running 65 and getting about 10.

If you're constantly on the expressway running 75+, sure, you'll never see higher numbers. If you back off the throttle a bit, you'll see better mileage.
 

Fatbob Frank

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Getting ready to tow our sleds up north in a couple weeks...
Using Tow/haul I only get about 10mpgs pulling a 4 place trailer...
I wonder how much of that is from running 75mph on the interstate...
 

Ratman6161

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I've had two different 2500s with 6.4L and 8 speed. First one was a 4.10 and the current one is a 3.73. About 85% off all the miles on both trucks were towing. of the 85%, 15% was pulling a light weight two place enclosed snowmobile trailer and 80% pulling our travel trailer that's 8736# GVWR and about 7600 ish as we load it. In i those miles I never really noticed the difference between the 3.73 and the 4.10. I didnsomemsteep grades pulling the travel trailer but eastern mountains with steep grades but not that high of an elevation. I guess it might matter more out west where high altitudes eat into the available power. As far as fuel economy goes I think which way the wind is blowing (headwind vs tailwind) has far more effect than which rear end i have.
 

RidgeRunner_167

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Gas mileage, it isn't going to be pretty but a 2509 with 4.10 isn't designed to be a mileage champion. My 2500 is a great truck and wouldn't buy a different one. Assume you are going to be towing something, you should be very happy with the service.
I have a 2024 3500 6.4 with 4.10's, club cab, 4x4. I get about 13 in 50/50 city/hwy driving in my daily commute. I'm not a leadfoot. Towing heavy, it falls to about 10.

Mileage is terrible, but this truck pulls well.
 
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