How about some gas mileage reports?

[Bigbird]

Going from NY to Florida 2021 GMC Yukon Denali XL 4wheel drive
First leg 435 Miles-21.1
Second Leg 440 Miles-21.7
Third Leg 408 Miles-22
Forth Leg 145-19.5
Most of it was at 70MPH

 

[MelloYello95]

First 1,500 were highway miles, the rest in town

 

[Norm 427]

2021 GMC 5.3 Liter with 8k miles.

My dash says 19.1 since new. I get a true 20.0 on a long road trip (using GPS miles and gallons pumped).

 

[Bigbird]

Coming Home
First Leg 376 Miles-19.7
Second Leg 316 Miles-19.4
Third Leg 349 Miles-20.2
Last leg 537 Miles-22.2
The last leg was doing a lot of driving at 55 MPH due to construction
Total for trip 3006 miles 18.6 MPG average

 

[Vic Vinegar]

Had a 17 Tahoe towing a 7000 lb trailer from IL to gulf shores AL. Family weight add 500 lbs. MPG 8.5 through the trip under load. New 21 Yukon XL Denali ultimate package duramax towing in the wind 9.5 ish. Don’t care about MPG personally but hoped the baby max would have done better. GM needs a modern day excursion. Would definitely rate an MSRP purchase if they were an option.

 

[TrueAt1stLight]

Cross-posting from a GD thread on the 6.2 motor MPG:

Denali standard wheel base with the 6.2L engine:

I’m averaging about 20.8 with 90% hwy. I had a flat a week ago and had to drive at or below the speed limit for about 85 miles, mostly hwy and netted 23.7 MPG!

If you stay in DFM mode you can hyper-mile some serious mileage out of these big trucks. I was driving on backcountry roads for almost 2 hrs for work the other day and even though the roads were really hilly I averaged almost 22.5 MPG as I was at or below 65 MPH the whole time and most often in DFM mode.

 

[Joeltz]

I know they say if you're buying a big SUV you shouldn't care about the gas mileage but I'm not one of those. I would be quite interested to know what our courageous buyers are seeing especially on the 5.3L. Trips, combined city highway, from the DIC or hand calculated all will be appreciated. How fast you drive, load of vehicle, etc. the more info the better.

2015 LTZ 2 WD
23.4 @ 66 mph 19.5 @77
Around town about 12 lots is stops and starts....... Cam and lifter swap to get rid of V-4 no difference in milage Stuck lifter @ 97,500 ....3100$ For parts and labor AND DYNO tune...... worth every penny !

 

[Blueinterceptor]

5000 miles on 21 Tahoe. 5.3L. 275/50/22 Michelin’s 38psi

 

[Quark]

5000 miles on 21 Tahoe. 5.3L. 275/50/22 Michelin’s 38psi

Is this average for 50 miles or 5000 miles?

What is the psi on the door placard? 38 seems high is this cold. thanks

 

[Blueinterceptor]

36 psi in door panel. I always ran 2 psi higher. It’s not the 5k avg.
snapshot in time 50 mile average. All highway