So... what type of gas mileage do each of the engines get?

[mikemc422]

The only ones I've got experience with are the 4.8 and the 5.3... the 4.8 seemed to get ~19-20 mpg (70% highway) on my commute and ~21-22 mpg on the interstate at 85-ish... the 5.3 got 16-ish on my commute, but I never got it on the interstate. What about the larger engines though? Anyone with the 6.0 or 8.1 that watches their mpg, or has a close estimate?

 

[Bowtie_Beast]

My XL Denali with the 6.0 says I get 14.0 avg on the dash computer.

 

[dreww2001]

It's most likely the fact I can't get enough of the Flowmaster!

 

[adventurenali92]

My 2006 Denali xl with the 6.0 is getting 14.6 around town right now according to my info center. I usually average about 19 when I go off the mountain and set my cruise control on the freeways, traffic allowing of course. And that's typically between 70 and 75mph on the freeway, where my cruise control is usually set.

 

[1992rs]

My SIC tells me I get around 13.8 on average with my 6.0 Denali.


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[Searay45db]

My 2006 Denali xl with the 6.0 is getting 14.6 around town right now according to my info center. I usually average about 19 when I go off the mountain and set my cruise control on the freeways, traffic allowing of course. And that's typically between 70 and 75mph on the freeway, where my cruise control is usually set.

Wow, 19 at 70-75? Is the dash computer telling you? Did they do something to the 2006 that they did not do to the 05? Mine is shipped with cold air intake, Magna flow, biggest one they make, I get 19 when I am between 45-50. 70-75, 16.

 

[adventurenali92]

@Searay45db ,I reset the computer when I go off the hill to see what it does when I cruise the highways. The last time I drove freeways was a couple weeks ago going to Vegas out the 15. 75 steady almost the entire way and I averaged 19. But then again my xl was also empty. It was just me and a small suitcase so I wasn't hauling heavy weight which is also usually the case when I'm down off the mountain and driving freeways. I don't know that there's any under hood differences in the 2005 and 2006 models. But theres a lot that can affect gas mileage. Where you buy gas, what octane, what oil your running on, how often and how hard you step on the accelerator, it all affects mileage.

 

[Sasquatch]

I have an 05 yukon with a blackbear 93 octane tune cai and a catback 3:42 gears with 275/55/20`s. Most often i travel to our property in central NY 150 miles from our house loaded with about 3-400 pounds of dogs and other stuff and i average 16.5 to 17 doing 70-75 but the whole way there is up and downhill. If i go to the jersey shore i average slightly over 20 because it`s mostly flat the whole way down. Around town i get around 14-14.5.

 

[adventurenali92]

@Sasquatch , which motor in your 2005 yukon?

 

[Sasquatch]

@Sasquatch , which motor in your 2005 yukon?

Sorry about that, That`s the one thing i left out It`s a 5.3.