Highway gas mileage

[tuffguy23]

I think my highway MPG is good for a 6000 pound vehicle. i snapped this today while keeping it at 62 - 65 mph. 2015 Yukon XL Denali. Of course many times it drops with speed.

 

[tom3]

Do you run regular gas?

 

[BG1988]

I think my highway MPG is good for a 6000 pound vehicle. i snapped this today while keeping it at 62 - 65 mph. 2015 Yukon XL Denali. Of course many times it drops with speed.

my last fill up on the Tahoe was 32mpg with 0% ethanol

BETTER then the sonic barely getting 19 with that little 4 banger 1.8L with the 10 or 15%(what ever it is)

in the corolla with the ethanol free i can get 45mpg on the highway

 

[OR VietVet]

I don't wanna hear it.........

 

[Joseph Garcia]

If I multiplied my gas mileage by 2, I could get close to the OP's gas mileage.

 

[tuffguy23]

Do you run regular gas?

Yes, I've always used 87 where i live. It will of course get more thirsty if i get happy with the pedal, but i get a bit of satisfaction of seeing nice MPG numbers and having the AFM do what it was designed to do, while still knowing there's 420 HP available if i want it.

 

[B-train]

I have a 2017 with the 6.2L and I put in a RANGE Device to keep it in V8. Normal daily driving by my wife is around 18 city, back roads, some highway. We just took it to Nashville and cruising 85 mph for the majority of the way home I averaged about 19-20. I've had as good as 23, but that's a hard one to duplicate at 75 mph. When watching the instant at 60-65, it will say between 26 and 32.

It's neat to see that kind on mpg from a heavy truck, I just don't trust the AFM and prefer V8 mode. Keep an egg shell under the right foot and she'll produce good numbers...LOL

But, a true story I had with a rental 2020 Escalade was a 35 mpg number when cruising home from CA on route 66. I let it run in V4 as long as it would and it really produced excellent fuel economy. I did find though that even GM with their programming knows that V4 isn't good for long term running and it tripped out after 25 miles of continuous V4 and wouldn't let it go back for about 10-15 minutes of driving. I'm sure the purpose is to clean up the dead cylinders, etc. I thought it was an interesting experience/experiment

The pic shows the real number. I reset the fuel economy screen as soon as I got in the truck to erase the "teaser" numbers that are factory set.

 

[BG1988]

I don't wanna hear it.........

just filled it up 30.4MPG This 6.0L Loves Ethanol free gas..

 

[OR VietVet]

just filled it up 30.4MPG This 6.0L Loves Ethanol free gas..

I said, I don't want to hear it dammit!

 

[BG1988]

i'll let you know about my weekly fill ups
Planing on some Eco mods belly pan to smooth out the aero dynamics more..

 

[rjm20]

I'm in the mid 16s with my 2016 with 5.3L and AFM turned off. Mix if city and highway. Much better than the 12-14 I was getting with my old Silverado.
Turning the AFM off seems to have dropped it ~2MPG for me. YMMV.

 

[shock]

Let’s just say I’m skeptical that anyone is getting 30+ mpg out of any full size GM stock truck with any fuel that is widely available to consumers. There is no way that is possible over, say, a full tank of fuel. I’d be impressed if you could get over 23.

*excluding 3.0 diesel—I have no idea what those numbers look like.

 

[SpyShops212]

I think my highway MPG is good for a 6000 pound vehicle. i snapped this today while keeping it at 62 - 65 mph. 2015 Yukon XL Denali. Of course many times it drops with speed.
View attachment 380809

What is that tape on the speedometer side from 0-50 mph?

 

[tuffguy23]

What is that tape on the speedometer side from 0-50 mph?

the tape blocks the annoying sun reflection from the chrome trim ring.

 

[RB_Trucker]

I used to get that kinda mileage when I was reverse leveled and on 22’s running 91 octane…. Now I’m lifted, run 33’s and hit around 17 highway

 

[dpollak81]

2015 Denali and we get about 13-14 with my wife’s normal kiddo shuffle within about 5 miles of the house. Gets 16-17 if she mixes a good amount of farther errands but any trips we take it easily gets 21-22 mpg and that’s calc’d in my app not off the read out. We always run Premium 91 octane though.

Of course we get about 10.5 when we tow our travel trailer LOL

 

[greenhornet]

With my 2015 Tahoe LS ,i get 24 mpg with AFM off and i have not noticed any difference in it's fuel mileage.Tha AFM never stayed engaged on the highway as to many hills and erratic traffic to be off any value.Around the city not worth the effort.This Tahoe is so much better than my 2000 Tahoe LT.