Real Life MPG 5.3 / 6.2

[drmoose]

In a 5.3, I have yet to zero out one of my trip counters. For what it is worth, 21k miles at 18.0 average. That is 60%+ highway driving. I feel this is probably pretty accurate.

 

[vcode]

We are currently on a short family trip and I did the driving today. The most non aggressive, slow accelerating, fuel sipping, no more than 5 mph over the speed limit driving that is possible. Wife annoyed with the slow rate of travel kind of driving. Mostly 50 mph two lanes but a touch of 70 on the freeway, almost all flat ground with very few hills. After 140 miles the dash readout says 19.2 mpg and I feel it would be pretty difficult to squeak much more out of a 5.3 than that.

That seems to jive with what others are seeing. Just for kicks, I put my 2010 on cruise at 40mph on level ground and saw 25-26 mpg on the instant read. That drops to 20-22 at 75 mph. I have seen 21 mpg on the 150 mile round trip to our cottage (100% freeway/highway with 4 stop signs each way).

 

[SSGUNNER]

i get upper 20s in my 5.3 at times (50mi average). But you are correct, it is (mostly) meaningless. When I am getting that, it is typically a 50mi stretch that is all "downhill" (descending from the Oregon high desert towards the Columbia River.

So lets talk about that. If its a “meaningless” feature then why did gm put it in the vehicle? Oh same goes for DFM.
Maybe you are speaking for yourself because I hate people speaking on my behalf and what you say is partly true. Give me a hwy in the United States of America that is 50 miles down hill. On my trip I was on flat ground with the stupid DFM kicking in and that avg likes to go up.

Is it a diesel? Otherwise the DIC is lying to you. No way you are getting 50% better mileage than anyone else on here.

Hell no its not a diesel. Im getting low 20’s on my 5.3 on avg. Dont hate me cause im getting better gas mileage than you. Do you want me to lie to you so you can sleep better at night?

To me it seems there may be some buyers remorse in this thread.

 

[SSGUNNER]

That seems to jive with what others are seeing. Just for kicks, I put my 2010 on cruise at 40mph on level ground and saw 25-26 mpg on the instant read. That drops to 20-22 at 75 mph. I have seen 21 mpg on the 150 mile round trip to our cottage (100% freeway/highway with 4 stop signs each way).

Exactly thats what you dont realize, you think its instant. Show me how you reset it on a 21. Maybe on a 2010 u can.

 

[firsttimetahoe]

So lets talk about that. If its a “meaningless” feature then why did gm put it in the vehicle? Oh same goes for DFM.

I think he’s referring to the fact that the best 50mile avg. when you’re driving in that type of condition is meaningless in comparison to what you’d normally get

 

[firsttimetahoe]

Hell no its not a diesel. Im getting low 20’s on my 5.3 on avg. Dont hate me cause im getting better gas mileage than you. Do you want me to lie to you so you can sleep better at night?

Low 20s on a 5.3 on average is nice. But most people look at other peoples MPG and dont realize the variables that can go into it.

I live in NY tri state and that’ll be impossible to get. And when I’m on the highway, my experience isn’t cruising lol. I also have a heavy foot so that’s not helpful. Plus I like to warm my car up in the winter before getting in it, so that’s not helpful.

If lived in an area where it’s mostly highway travel with no traffic, I drove like a grandma and I didn’t mind freezing my balls off for 5 minutes in the morning, then yes I’d expect much better MPG

 

[vcode]

So lets talk about that. If its a “meaningless” feature then why did gm put it in the vehicle? Oh same goes for DFM.
Maybe you are speaking for yourself because I hate people speaking on my behalf and what you say is partly true. Give me a hwy in the United States of America that is 50 miles down hill. On my trip I was on flat ground with the stupid DFM kicking in and that avg likes to go up.


Hell no its not a diesel. Im getting low 20’s on my 5.3 on avg. Dont hate me cause im getting better gas mileage than you. Do you want me to lie to you so you can sleep better at night?

To me it seems there may be some buyers remorse in this thread.

Why don't you give us a 1 or 2 week average instead of a tiny snipet under optimal conditions? BTW, my 21mpg was the average for the 150 mile trip, notan instant reading during it.

 

[drmoose]

So lets talk about that. If its a “meaningless” feature then why did gm put it in the vehicle? Oh same goes for DFM.
Maybe you are speaking for yourself because I hate people speaking on my behalf and what you say is partly true. Give me a hwy in the United States of America that is 50 miles down hill. On my trip I was on flat ground with the stupid DFM kicking in and that avg likes to go up.


Hell no its not a diesel. Im getting low 20’s on my 5.3 on avg. Dont hate me cause im getting better gas mileage than you. Do you want me to lie to you so you can sleep better at night?

To me it seems there may be some buyers remorse in this thread.

dude what's with the anger? I'm pretty sure no one really cares what mileage you are getting.

 

[Koepp2637]

2021 AT4 -~8000 miles - Been keeping track of mileage via Fuelly App since purchased in July last year. I am averaging 14.0 MPG during this time with the best being 17.0. I wonder if there is a difference with the AT4/Z71 body trim vs Denali/etc.

 

[Baja_Bob]

Is there a live mpg screen on the '21 like on the '19, all I find is an average mpg on the trip screen

 

[SSGUNNER]

dude what's with the anger? I'm pretty sure no one really cares what mileage you are getting.

 

[R32driver]

Is there a live mpg screen on the '21 like on the '19, all I find is an average mpg on the trip screen

It's the same screen where you get the controversial 50 mile best number from. I had to go through the settings and turn it on as it wasn't appearing when I'd toggle through the different options. I changed mine to record the best from 450 miles, which is about the fuel range of a 5.3 (mine says 475 when full) and after 275 miles it says the best is 21 mpg. This tank of gas the average has been hovering right around 18.2 so slightly better than the lifetime average that remains dead on at 17.5

 

[R32driver]

18.1 average on that last tank and after filling up tonight the range has gone up a bit to 503 miles. 87 octane no name gas from the local farmers co-op

 

[ChemEng]

6.2L Z71 about 250 miles on the odometer, looks like I am getting low 16's mpg on my commute (75/25 highway/backroads). Not too bad.

It is my first tank of gas though and i am suspicious my ignorant sales person filled it with regular instead of premium... Filled it myself for the first time yesterday so lets see if there is any improvement.

Either way all the idling from messing with the settings has destroyed my "lifetime" average...

 

[WalleyeMikeIII]

6.2 l Yukon XL Denali. Stock 22” Wheels/Alenza Tires

Just took my first “road trip” in what I would call summer-like conditions. 200 Miles from Rochester MN to Near Willmar MN, mix of divided highways and 2 lane highways, plus through the Minneapolis/St Paul area on I-494. Not much wind, generally flat terrain, temp 78F

Avg: 20.8 MPG. 54.5 MPh. 92 Octane from Costco. More than pleased with this.

 

[WalleyeMikeIII]

6.2 l Yukon XL Denali. Stock 22” Wheels/Alenza Tires

Just took my first “road trip” in what I would call summer-like conditions. 200 Miles from Rochester MN to Near Willmar MN, mix of divided highways and 2 lane highways, plus through the Minneapolis/St Paul area on I-494. Not much wind, generally flat terrain, temp 78F

Avg: 20.8 MPG. 54.5 MPh. 92 Octane from Costco. More than pleased with this.

Wasn’t a fluke, here is the return trip and the total, super happy with this!!

 

[Lakerider]

5.3 SLT with 8k miles, overall average 17.5 but reset for recent road trip to Vermont from Virginia with some pretty aggressive speeds and return load of college girl crap.....averaged 21.5. I was pleased. I also use regular gas, just 87. The engine seems to be getting better, smoother now that we have a few miles on it. I don't know if this makes sense, but feels like I get better mileage from top grade stations--exxon, mobile--than Sheetz and WaWa gas. I have some empirical data but done by the seat-o-the pants....Its as good or better than our 2011 v6 Honda Pilot.

 

[xycrazy]

6.2L Tahoe High Country. 80 miles Highway and 5 miles city

 

[RST Dana]

Many posts have indicated the only “real” way to check your mileage is using your Casio calculator and fuel receipt. The info screens only give you a warm fuzzy feeling, kinda similar to the feeling your salesperson gave you as you left the lot.

 

[WalleyeMikeIII]

Many posts have indicated the only “real” way to check your mileage is using your Casio calculator and fuel receipt. The info screens only give you a warm fuzzy feeling, kinda similar to the feeling your salesperson gave you as you left the lot.

I didn't use a casio, I used the calculator built in my iPhone, but that calc was as follows:

487.4mi/23.4gal = 20.83 MPG, my ride said 20.7, I'll chalk up the difference in the small variance in how much fuel added, and to whatever degree the onboard is not accurate.

BTW, the ECM knows exactly how much fuel is injected into the engine (knows how much fuel per injection, and counts injections), and the odometer is probably pretty accurate, so my assessment is that the onboard computer is pretty close...validated by this calculation.

My boat's ECM calculate's fuel used, and is usually within 0.1gal of what I add, on a regular basis...
Net, I think this tech is pretty well hashed out by now.