I have a 2021 GMC Sierra AT4 w/the 3.0L. I have aftermarket KO2 tires. Just made a round trip drive from Nashville to Detroit and back and averaged 27.6 mpg. Very happy.
Same but I'm way up north. LZ0 3.0 LTZ CC Long Bed with 3.73's. Lots of hills and twisty roads. Still get 29 on average. My best so far is 32.6 on a 400 mile run. Very little DEF usage.
I went to Florida in February with my 2023 AT4 3.0. Put on 3500+ miles. On average I got 32-36.5 mph. Mostly hwy but also driving 75-85 mph . Not complaining at all.
You must have been doing 100mph is the diesel and 35 in the gas truck. I have a 2023 3.0 diesel AT4 and another guy at work has the same truck round trip MPLS to Chicago he averaged 33 mpg. My truck from MPLS to Canada was 31.5 mpg. Everyone else at my work( these are all company trucks) with 6.2 gas average less than 18 on a long road trip.
I never even got close to 33mpg with the 3.0 when trying to get good mpg. Best I got was 30mpg on a 40 mile highway. With that being said I did have the lm2 not the lz0
Your 6.2 buddies are flooring it then😂 I get over 20 mpg with my 6.2 and just got 21mpg averaging over 60 mph with a round trip of over 400 miles and half that trip was into a strong head wind
I averaged 35mpg with the LZ0 yesterday going through Yellowstone Park, only averaged 23 with the 5.3 liter, averaged about 22 in the 6.6 duramax. Oddly there are times when they are similar though (esp during regen) Currently own all 3.
Can you keep these videos going? I’ve been in the market and kept up with your reviews the last fews weeks. One of my biggest frustrations with GM… no extended fuel tank option. Now F150’s are 36 gal standard on all trims for 2024. Question. Do you recall what speeds you were at? Do you know what kind of range you get 3.0 vs 6.2?
I guess I could have done the math of your trip + range, haha. Thanks this is helpful. I do a straight shot from Denver to Omaha 4-5x yr and trying to get into something that wouldn’t require a fill up. Winds and altitude here make efficiency tough, which is why I was leaning diesel. Maintenance on the 6.2 makes me wonder if it’d be more reliable? I’m not sure. I wonder what you’d get at 75-85 mph (speed limit on my route). Was thinking of a Turo to test it out my self.
@@PhotoColin check out TFL. They do a few efficiency test called the Denver 100. I believe they did both the 3.0 and the 6.2 so that would probably give you your answer.
@PhotoColin I have a 24 yukon denali xl with the 6.2. Thing gets a whopping 13 mpg or 300 miles on a tank of premium gas. My brother has a silverado with the 3.0 and gets 20 ish which is sad because my 23 at4 3500 6.6 duramax gets 20 and it's lifted on 37's.
Yea it all depends on how fast I drive, if I go between 55-65 I can get crazy mpg like 33 my best was 40.3 on my 24 3.0 2WD 18” rims but if I drive over 70-80 it’s like 23-24 I had a 2018 5.3 v8 and got great gas mileage around 23 I also briefly had the 2.8 it was around 19 mpg but I was always gassing it definitely depends on how and where you drive
little worse mileage ... but WAAAAY better sound and powerband. the 3.0 is a great engine and reliable, nothing wrong with it. but the 6.2 is for me all day
@@moorefaith23 He's talking about the 6.2 which definitely has cylinder deactivation. The only way you're averaging 23 mpg with a 6.2 is by having DFM on.
@@brians.1357 Well he didn't say for the life of his canyon. The 6.2 also benefits from using 91+ octane fuel which tends to not have ethanol and therefore more energy per unit of fuel than a V6 running on 87 ethanol blend. For what it is worth, I have managed to get as high as 29 mpg (400 mile average) with a DFM 5.3 Silverado by using hypermiling techniques like canceling cruise control and coasting down to a slower speed limit instead of using brakes. Using premium fuel without ethanol was usually good for another mpg.
You are NOT putting "a lot" of miles on it. I have 82k on my 3.0 AT4. If you even have a hint of a headwind or tailwind it can skew those numbers drastically.
Something is wrong as your results, high 6.7L and low 3.0L results, don't appear repeatable by others. It would be all over RU-vid if was commonplace narrow spread difference yet there are none, nor individuals reporting similar in comments - none thus far on 6.7L and 3.0L typically exceeding yours. For a larger sample, just checked Fuelly which reflects actual usage and calculated on mileage and gallons at fill-up. There is a HUGE spread, in fact the average 16mpg for the 6.7L was the low end 15-16mpg for the 3.0L which I presume would be towing and RV. The 6.7L average 16mpg on 52 fill-ups with a high of 21mpg on 3 fill-ups and low of 12mpg on 2 fill-ups. Of the 12 vehicles in the sample, the high average with 4 trucks was 16mpg. Further the 5.3L bested the 6.7L by 1 to 2mpg but wont go into specifics. Now the 2024 (I know yours was a 22 which had similar results) the high average ranged between 22 and 24mpg on 358 fill-ups - which far exceeds the 6.7L's 16mpg. On outliers, 31mpg on 2 fill-ups and 15mpg on 8 fill-ups which I presume was towing mileage. Of the 63 trucks in the sample, 12 trucks returned the high average at 24mpg.
I personally feel like this depends on how you drive. I know people that have 3.0 that claim they get 30mpg on the regular and there are people that claim they get in the low 20s on the regular. A lot of this trip was highway (country) miles which is why the 6.2 got 23 miles of the gallon. In the video, I was not saying that if you get the 6.2 you’re going to get 23 miles to the gallon every single time you drive but I believe you can consistently get in the 20s. which is still 4-7 MPG’s difference or as others claim up to 13mpg from the Duramax. But I was just going off my results.
I have had my 2020 sierra 3.0 duramax since 2020 and continue to get an average of 9L per 100Km for my canadian friends. Buddys with the 5.3's get 12-13L per 100 on average.
@@Bucky_BB Its true, even if you take into account the price of DEF and price of diesel vs gas still saving roughly 30$ every 2 weeks ( canadian ) compared to a 5.2 gasser
I have zero experience with both of these engines. What I do have experience in is calculating "actual" cost of driving different vehicles. You MUST calculate total cost of a vehicle which includes many things most don't think about. Compare vehicle msrp, resale values, Insurance costs, maintenance costs, DEF if diesel vs not, diesel vs gas prices and a few more things but you get the picture. Back in '07 when I bought my Dodge Ram diesel I calculated I could pay .50 per gallon more than gasoline in my Silverado and break even with fuel costs. That's just one example I calculated. It's not just about MPG. Bottom line is, what is your total cost per mile to drive xxx vs xx? It's all simple math.
@@brians.1357 I did not know that. We just sold a Subaru Forester XT that required premium fuel due to its turbo. We bought a new 4 Runner that gets about the same MPG as the Forester but we save a little because it doesn't require premium. Insurance is more of course and the msrp is 23K more than the '15 Forester. Ya it's more money for sure but that's inflation for you. I question how people are calculating their mpg. Are they doing it by hand or using the trucks computer? I've had vehicles in the past where the computer was off a little and some were off a lot. Are they resetting the computer for a trip? Are they observing actual current time mpg? I don't know what both trucks are capable of calculating or if they are accurate.
I don't trust the 3.0. I'm working on one right now with a broken timing chain, it destroyed all the lifters and valves when it broke. About 2 weeks ago I had one in my shop that had a loud knock, I had to put a new oil pump in it. Only 32k miles.
The 3.0 is based on the BMW B57. The basic design of the engine has been around for a very long time. The timing chain probably broke due to the high pressure fuel pump failing and putting a sudden shock into the chain. The problem is that the general public doesn't know nor care about the key things required for keeping a diesel engine happy. They buy diesel from the worst places (including buying garbage biodiesel) and never think to use an additive that improves the lubricity of the fuel. That's the first bad oil pumps I've heard of with the 3.0. That's usually a 5.3/6.2 thing with that variable displacement oil pump. There are some guys that hate the idea of 0w20 in a diesel engine and I wouldn't put it past someone to put 30 or 40 weight oil like Rotella T6 in instead because they know better than the engineers.
From my experience, they relatively get the same MPG. But the 5.3 does take regular and the 6.2 recommends premium so the 5.3 would be cheaper in the long run.
