2025 Yukon 3.0l Diesel MPG Discrepancy

[Javelina]

Just lifted a window sticker of an In-Transit Yukon from the internet. The fueleconomy.gov mpg on the sticker indicates 24mpg highway but the fuelenonomy.gov web site lists 26mpg highway.

Any thoughts on why the discrepancy?

 

[Stbentoak]

It gets what it gets depending on your driving, but no matter what, it's at least 40% better than the nearest petrol engine. Not really worried about what the sticker says...... We know how good it is.....

 

[Boosted350]

The diesel's increase over the 5.3 and 6.2 is why I opted for it and why I am still waiting for my allocation. My wife and father both nagged me to get the 6.2, but for a daily driver I cannot compete with the 3.0's fuel economy.

 

[AMWWORKS]

Just lifted a window sticker of an In-Transit Yukon from the internet. The fueleconomy.gov mpg on the sticker indicates 24mpg highway but the fuelenonomy.gov web site lists 26mpg highway.

Any thoughts on why the discrepancy?

I was wondering the same thing. So I looked up a window sticker of a 24 LM2 Yukon and it doesn't really match the EPAs numbers either. I guess its like what @Stbentoak said. We'll get what we get while driving. Its going to be better than the gas burners anyways.

 

[Stbentoak]

Just for the record... Diesel models usually EXCEED epa numbers while gas models usually don't meet advertised numbers.....

 

[steiny93]

Just for the record... Diesel models usually EXCEED epa numbers while gas models usually don't meet advertised numbers.....

what is this based on?

 

[Stbentoak]

Well, it's basically based on many records of recorded mileage of owners that I have read about over the years in various EcoDiesel and Duramax forums I have participated in.
There has been a general recorded consensus that their vehicle is EXCEEDING the recorded EPA # on the sticker on Diesel vehicles. I've hardly ever seen a large V8 or HD truck gasser ever exceed, let alone even come close to EPA #'s on their sticker on a regular basis....

 

[toad1987]

My wife's Tahoe 3.0 gets 28-30 mpg all day cruising at 75-80 on the freeway. My MPG information page for the last 450 miles is 26 mpg which includes a good mix.

Just treated myself to a 2025 AT4 and that also gets far above the window sticker. Even with the factory lift and aggressive tires I average 26 MPG per 450 miles. Just drove it 300 miles to southern Utah with a constant 30 mph headwind. I still averaged 21 mpg cruising at 80 mpg. To Stbentoak's point, I would have maybe pulled 12 mpg in those conditions with my 2006 5.3 Silverado that I just let go.

The 3.0 is worth the wait. Took me a full year back in 2022 to get our Tahoe even though many gas options were on the lot that tempted me.

 

[Stbentoak]

My wife's Tahoe 3.0 gets 28-30 mpg all day cruising at 75-80 on the freeway. My MPG information page for the last 450 miles is 26 mpg which includes a good mix.

Just treated myself to a 2025 AT4 and that also gets far above the window sticker. Even with the factory lift and aggressive tires I average 26 MPG per 450 miles. Just drove it 300 miles to southern Utah with a constant 30 mph headwind. I still averaged 21 mpg cruising at 80 mpg. To Stbentoak's point, I would have maybe pulled 12 mpg in those conditions with my 2006 5.3 Silverado that I just let go.

The 3.0 is worth the wait. Took me a full year back in 2022 to get our Tahoe even though many gas options were on the lot that tempted me.

Yep.. Same here.... I really wouldn't have dropped 100K+ on a new one if I surely didn't think it was seriously worth it.... and it is....
I'm pretty sure my 25 will be 6 months (Ordered Mid Dec 24) in all reality before it hits the ground running... But that is all forgotten about on the 1st drive home.....

 

[Jeff O]

Just lifted a window sticker of an In-Transit Yukon from the internet. The fueleconomy.gov mpg on the sticker indicates 24mpg highway but the fuelenonomy.gov web site lists 26mpg highway.

Any thoughts on why the discrepancy?

Could be it's not apples to apples. Vehicle weights can vary, e.g. 2 row seats v. 3 row; tire size or inflation pressure. Exact data of the pariculars of what/when any test was made may affect why two figures are published.

 

[ZKWBQD]

Just lifted a window sticker of an In-Transit Yukon from the internet. The fueleconomy.gov mpg on the sticker indicates 24mpg highway but the fuelenonomy.gov web site lists 26mpg highway.

Any thoughts on why the discrepancy?

In the real world, you'll probably get around 20 miles per gallon. Although I must admit, gas mileage means nothing to me. I would avoid diesel and go with gas.

 

[sikhoe]

I have heard from many diesel owners getting 28-30mpg.

Gas has been under 20mpg

 

[Stbentoak]

In the real world, you'll probably get around 20 miles per gallon. Although I must admit, gas mileage means nothing to me. I would avoid diesel and go with gas.

In the real world from a real OWNER, I'm over 20 MPG in the city in bumper to bumper traffic with the AC on high. NO V8 would ever crack that....

 

[CTown Duramax]

Cruise 75-78mph get 30-33mpg. 39,000 mile lifetime fuel milage same as for my 2016 v-6 Impala. Commuting and cross commuting in Boston 18-22mpg. Heavy stop and go in winter - 1/2 hr to go two miles - will take it down to 14mpg. I think if I lived rurally again I would be getting 25-26mpg. But the real reason to get this engine is the smooth way it drives. And I don't think it gives up any acceleration to the 327 V-8.

 

[JayceeP]

Cruise 75-78mph get 30-33mpg. 39,000 mile lifetime fuel milage same as for my 2016 v-6 Impala. Commuting and cross commuting in Boston 18-22mpg. Heavy stop and go in winter - 1/2 hr to go two miles - will take it down to 14mpg. I think if I lived rurally again I would be getting 25-26mpg. But the real reason to get this engine is the smooth way it drives. And I don't think it gives up any acceleration to the 327 V-8.

At those speeds, I do not get 30+ mpg. Maybe on flat highway. More like 25 for me. But still very good imo.

 

[StephenPT]

At those speeds, I do not get 30+ mpg. Maybe on flat highway. More like 25 for me. But still very good imo.

I don't see above 30 when I'm 70mph+ - ~28mpg is what I'm usually getting. However, with cruise set at 60mph, I'm in the mid-30's. The best I've ever gotten over a 2+ hour stretch is 38.4mpg - speed ranged from 55-62mph.

The one nice thing about above 70mph is the engine does enough work that EGTs are high enough to get some passive regen. I can watch the DPF soot load % drop and I get more like 500+ miles between regens.

 

[JayceeP]

I don't see above 30 when I'm 70mph+ - ~28mpg is what I'm usually getting. However, with cruise set at 60mph, I'm in the mid-30's. The best I've ever gotten over a 2+ hour stretch is 38.4mpg - speed ranged from 55-62mph.

The one nice thing about above 70mph is the engine does enough work that EGTs are high enough to get some passive regen. I can watch the DPF soot load % drop and I get more like 500+ miles between regens.

Good point and yeah, I’m really happy to hang around 25 mpg at 75mph+. I’m sure you’d be lucky to get 16-18 in the V8!

 

[LEsoftballdad]

My 24 Yukon SLT gets 25-26 on the road with the cruise on 75. I don't know how anyone gets in the 30s at those speeds. My best 50 miles per gallon was 34.9, but my average speed for that trip was 52 MPH. You're pushing a 5,500-pound box down the road that isn't very aerodynamic. Also, where I live, diesel is at best $3.50 per gallon, and regular gas is $2.69. I am not saving money on fuel, but I am happy not to be part of the recently announced massive recall of the 6.2-liter engines.

 

[JayceeP]

My 24 Yukon SLT gets 25-26 on the road with the cruise on 75. I don't know how anyone gets in the 30s at those speeds. My best 50 miles per gallon was 34.9, but my average speed for that trip was 52 MPH. You're pushing a 5,500-pound box down the road that isn't very aerodynamic. Also, where I live, diesel is at best $3.50 per gallon, and regular gas is $2.69. I am not saving money on fuel, but I am happy not to be part of the recently announced massive recall of the 6.2-liter engines.

Yeah I feel like diesel needs to be within 10% of gas prices, max 15%… however, the extended range on road trips is great. You never think about having to fill up too soon!

Right now gas is only a couple cents less than diesel where I live so it’s real savings for sure.

 

[Stbentoak]

RUL is 3.29 where we are. Diesel is 3.25-3.45. Premium which the 6.2 needs....4.29 Unless you wanna wait in line at Costco in a 40 car line.
Especially with the current 6.2 issues, the 3.0 Duramax is the undisputed logical choice for this big vehicle. The Duramax value and demand will increase as the 6.2 resale value plummets as it's recall covers so many years and so many vehicles.