Real Life MPG 5.3 / 6.2

[xycrazy]

I'm trying to figure out the difference between the 2 V8s when it comes to gas usage.

Can you guys throw your numbers over the fence?

What engine and what do you get on highway, city, combined?

Try to get a better picture. Thx

 

[Micahsd]

2021 Tahoe 4WD with 5.3 and 8,200 miles.

Best MPG I’ve seen is 22.3 but the wind must’ve been pushing me that day.

I typically drive on town on short trips and average about 12 MPG. When I warm up the car on cold winter days when the temp is near zero that drops down to about 10 MPG.

 

[Banks22]

2021 Tahoe 4wd 5.3, 10,500 miles. Country driving, 50-60 mph for 3-4 miles then stop signs and small town driving, average is 17.5 mpg for the entire mileage of vehicle. My 2019 Silverado has 5.3 and with 34,000 miles the avg was 17.9 mpg

 

[SSGUNNER]

2021 Tahoe RST 2WD 5.3 and 10,111
Currently averaging 17.3 with mixed driving (city/hwy). On city driving only I’ll average about 12.8. Best I’ve got was 26mpg on the hwy but there is no fun in that.

 

[Steveo123]

These new gens are terrible compared to last. I have a Tahoe Z71 6.2 and it gets about 10-11 city driving and that is driving very conservative. My 6.2 18 Denali XL 4wd got a consistent 17mpg around town. I’m not sure what they did to make the mpg worse then last gen, only thing I can figure is they are way heavier.

 

[Philpug]

I have been in a 2021 'Burban rental with 46K for the past 5K miles and have been getting 16-18MPG highway loaded with a box on top. I am actually kinda disappointed with the MPG. My 18 with the same mileate was getting about 1-2 MPG more and it is about the same MPG that I got with my 08 that hat 185K on it.

We are exploring getting a 22, but will go with the 3.0 Duramax.

 

[Stbentoak]

I am at least glad that I see some sincere honesty among these posts. Many who have made the 5.3/6.2 choice try to inflate their numbers to help justify their choice.
But the above # are real world, especially in the city for either engine. I used to have a Hemi RAM which was a great truck, but it couldn't get much above 14 MPG with a wind behind it.
Those days and 4.00 gas back in 2013 era pushed me over the edge to all Diesel vehicles and I haven't regretted it since...

 

[WalleyeMikeIII]

22 yukon XL Denali, 6.2 Gasser. Just did a 550 Mile Road trip, with some thrown in city miles and starts/stops, averaged 17.8 for the entire 553 miles. Ran 92 octane from Costco. Best 50 Mile Stretch was 22.6 according to the vehicle computer.

In town driving here in Frigid Minnesota is around 14-14.5 right now, not much warming up/remote start.

My 2013 LTZ Suburban with 5.3 and Max Trailering Package usually got 13-13.5 in town in same temps in winter, and about 17.5 on the same type road trip as this one.

Therefore, I am pretty satisfied w/ the 6.2, as it is +90HP, +900cc of displacement, and getting the same fuel economy. I am also expecting things to get a bit better with a few more miles (only 1300 on the clock so far), and warmer temps in spring/summer.

 

[R32driver]

I don't calculate fuel milage as I really don't care and did not buy a massive yukon xl with any delusion it would get remotely good milage but according to the dash our lifetime average at 10k miles with our 5.3 has been 17.5 mpg. That is better than most of our other vehicles so zero complaints from me. Most our driving is on country roads/highways and not a lot of city

 

[Saltydog]

We have a 2021 Yukon 5.3 with 4x4 and in the city is about 14-16mpg and the highway is about 20-22 without much effort. If I really lay easy on the pedal, I have seen about 25-26mpg.

 

[xycrazy]

These new gens are terrible compared to last. I have a Tahoe Z71 6.2 and it gets about 10-11 city driving and that is driving very conservative. My 6.2 18 Denali XL 4wd got a consistent 17mpg around town. I’m not sure what they did to make the mpg worse then last gen, only thing I can figure is they are way heavier.

WOW! This is shocking. Are you sure that nothing is wrong with your truck? I mean... 5-6mpg less... that's horrible! Can't believe it's just the weight and the added height of the Z71. How much miles do you got so far?

 

[RST Dana]

The real deal is to manually check and not solely believe the vehicle display. I have an fuel app that does it for me. I can look at the logs to compare brands and seasons as well.

 

[ChrisG]

My 22 Tahoe RST 4wd gets about 16 ish so far with 3,000 miles, hope it gets better, mostly highway. My 2018 Tahoe was a solid 18 driving same regular routes. I hope my new one improves but my wife says I like driving it fast

 

[SSGUNNER]

WOW! This is shocking. Are you sure that nothing is wrong with your truck? I mean... 5-6mpg less... that's horrible! Can't believe it's just the weight and the added height of the Z71. How much miles do you got so far?

Maybe the AT tires on the Z71 are under inflated? When i had AT tires on my Hemi I would run them at 39-40 PSI for best mpg.

 

[R32driver]

We have a 2021 Yukon 5.3 with 4x4 and in the city is about 14-16mpg and the highway is about 20-22 without much effort. If I really lay easy on the pedal, I have seen about 25-26mpg.

Interesting...I've owned a 5.3 equipped vehicle for 10 years now and NEVER have seen over 20 and I drive like a little old lady most the time. I did a 1K mile round trip all highway when we first bought our '21 and both hand calculating and the computer came back at 18.4 mpg

 

[EMTPete]

I know you are comparing the two gas engines, but I have a ‘21 Yukon 4WD with the 3.0 diesel. On highway road trips I’ll average 26-28mpg at close to 80mph. Mixed driving around town gives me about 23-25mpg. The best I have seen has been 32.5mpg which was a stretch of open road at 50-55mph using adaptive cruise control.

 

[Seamus]

The new truck is such an improvment in so many categories. Beautiful highway cruiser. We test drove a '21 Denali 6.2 and were really impressed with the ride and truck. We had a 2017 Denali XL 6.2 which got pretty good mileage. Saw 24 mpg driving nice on hwy often, routinely 21-22 mpg. That generation the 6.2 actually got better mileage than the 5.3. BUT the 2021 mileage was pretty bad. Then we reneted a Suburban for a month w 5.3. Could not wrap my head around that the mileage went down on a new vehicle? Then heard the Denali 6.2 was much worse and took premium also as we know. Dealbreaker for me. Tried to find a 3.0 Denali to no avail at the time, then Covid and the insane market change. So found a 2021 Sierra Denali w/ the 3.0 and the ultimate package and have fallen in love with this motor! Mileage is everything you hear...great. Between the lifters and the mileage, its not even a consideration till we find a deal on a Yukon XL with the 3.0.

 

[gregus733]

My 2021 Suburban Z71 4x4 5.3 get 17.5 to 18 mpg. Mostly freeway driving. My last 2020 Sierra Denali 5.3 got 20-22 mpg mostly freeway. I drive moderately, not too conservative but not pushing on the pedal either.

 

[Steveo123]

WOW! This is shocking. Are you sure that nothing is wrong with your truck? I mean... 5-6mpg less... that's horrible! Can't believe it's just the weight and the added height of the Z71. How much miles do you got so far?

2k on the odo. Had a 21 Denali XL last year and it got around the same if I remember correctly. My Tahoe does not have the auto stop, not sure how much that would of helped. I looked at my window sticker and it says 14 mpg city so 10-11 in my city with all the traffic seems about right.

 

[ljn21]

21 Denali 6.2 with 13800 miles, lifetime hand calculated mileage is 16.9 which is probably a 60/40 mix of highway/city. Took a trip last week for 283 miles mostly highway until destination and then back again, 2 adults and 2 kids and probably 90/10 highway/city and hand calculated mileage was 22.9. Pretty pleased with the mileage honestly, considering it’s a huge family and gear hauler.