5.3 v 6.2 daily use and mpg

[boomerc154]

If I were ordering a Tahoe the 5.3 would be great. If I were ordering a burb. I’d go with the 6.2. Just remember that the 6.2 must use premium gas.

Premium fuel is only "Recommended" for the 6.2 by the factory. In contrast, Ram "Requires" premium for the TRX. When the factory "Requires" premium, then you're walking a very thin line with the warranty. Big difference..

 

[Stbentoak]

Also while you might get away with it short term or here and there... not using premium can cause longer term issues that warranty won't cover.
We had a "Recommended " vehicle in the past that as soon as you put 87 in it, it would throw a CEL. As soon as you switched back, it would go off... The higher gas goes, the more they screw you on premium. Currently +.60 cents in our area but I've seen it as high as +.80 cents. I flatly refuse to participate....

 

[Gibby13]

Also while you might get away with it short term or here and there... not using premium can cause longer term issues that warranty won't cover.
We had a "Recommended " vehicle in the past that as soon as you put 87 in it, it would throw a CEL. As soon as you switched back, it would go off... The higher gas goes, the more they screw you on premium. Currently +.60 cents in our area but I've seen it as high as +.80 cents. I flatly refuse to participate....

That was probably do to knocking. If stock and it is not knocking there is no reason to use premium gas. And it will not cause an issue with warranty at all.

 

[boomerc154]

Also while you might get away with it short term or here and there... not using premium can cause longer term issues that warranty won't cover.
We had a "Recommended " vehicle in the past that as soon as you put 87 in it, it would throw a CEL. As soon as you switched back, it would go off... The higher gas goes, the more they screw you on premium. Currently +.60 cents in our area but I've seen it as high as +.80 cents. I flatly refuse to participate....

I've also heard that there was an "Unwritten Agreement" between the major vehicle manufacturers and the fuel industry to recommend or require higher octane fuel for manufactured vehicles in exchange for a slew of perks... albeit monetary or otherwise... Then again, this was just a rumor...

 

[xycrazy]

Any mpg updates? Especially interested in the 6.2

 

[Gibby13]

2021 Yukon XL Denali 6.2

 

[WalleyeMikeIII]

2021 Yukon XL Denali 6.2View attachment 367239

Was that info something you can get at from the MyGMC app

 

[Gibby13]

Was that info something you can get at from the MyGMC app

Yes using https://github.com/michaelwoods/onstar2mqtt

 

[THarber]

Get the 6.2. It's worth the money and worth the premium fuel, so what? The only people saying that the 5.3 is as good are those who have nevedr driven a 6.2 or who can't afford to do so. My truck puts a smile on my face every time I drive it. No its not a race truck but it will get out of its own way and it can leave some Fords scratching theiur heads. Get an aftermarker tune and mpg and smiles per gallown will also increase.

 

[Gibby13]

Get the 6.2. It's worth the money and worth the premium fuel, so what? The only people saying that the 5.3 is as good are those who have nevedr driven a 6.2 or who can't afford to do so. My truck puts a smile on my face every time I drive it. No its not a race truck but it will get out of its own way and it can leave some Fords scratching theiur heads. Get an aftermarker tune and mpg and smiles per gallown will also increase.

Have you found somewhere to get the 2021+ tuned?

 

[xycrazy]

While they do recommend premium(93) gas for the 6.2 it is not required. As low as 87 can be used as long as their is no knocking.

In our '11 Escalade we never used premium and had around 120k on it when we traded it in and never had a single issue with the engine. We averaged around 17mpg.

We've been using regular in our '21 Denali so far and only averaging 12.5mpg after 1400 miles. Told the wife the other day next time to go premium for the next 1400 miles and see how it goes.

View attachment 274167

How was that going

 

[Fast_AT4]

Have you found somewhere to get the 2021+ tuned?

In dream land only sadly. Coming from all the cars listed in my signature and 1 more...they have all been tuned. If anyone EVER cracks it....confirmed proper after any air updates...I will be first in line.