Trucks & Trailers - Gas mileage on +07 Tahoes, Suburbans and Yukons

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Joe
03-11-2011, 10:55 AM
What are y'all seeing?

My '07 2wd Yukon 5.3 l (with the active cylinder management), 4spd auto, and little rear end gear (3.42?) I've had for 3 months, 38k miles, I've yet to see more than 15 mpg..normally around 12-14 mpg. I drive very conservatively, and 11miles of my 17 mile drive to work is highway.

Funny that I had a '91 4wd Jeep grand wagoneer, 3 spd auto, 360 cubic inch ancient design engine with a carburetor never got less than 12 mpg, and once I saw 17 mpg with it. Not much progress IMO in 16 years.


C Dave
03-11-2011, 11:01 AM
08 Sub LTZ 5.3 average MPG = 17.8

csvencer
03-11-2011, 11:02 AM
07 Surburban 4x4, 5.3L 1500 - Getting 14-15 around town and anywhere from 17-19 on the highway. Not sure why you are seeing such lower numbers, especially for a 2WD.

-Svence


LMychajluk
03-11-2011, 11:07 AM
07 Avalanche LTZ 4x4 (same chasis / drivetrain as Suburban) w/ 4.10s. 14 MPG if I'm lucky, but for long highway trips, I can get up to 16.5.

Port Monster
03-11-2011, 11:12 AM
07 Suburban LT - If I pay attention and do not let my heavy foot take over I get 14.5 around town. If I hammer the hell out of it I get 13.5. Highway I can pull 16 - 17. Pulling my boat is 6.5. ;? I have noticed that the fuel management system in that car takes a lot off of you MPG for traffic lights and I lose a lot of MPG's in hilly areas.

Joe
03-11-2011, 11:15 AM
Hmm..troubling. truck runs great and has new tires/alignment.

I notice the computer is almost dead on from a mileage and fuel used perspective.

Port Monster
03-11-2011, 11:24 AM
[QUOTE=Joe;3597123]Hmm..troubling. truck runs great and has new tires/alignment.

I notice the computer is almost dead on from a mileage and fuel used perspective.[/QUOTE

Tires matter - they can actually bring you down in MPG's. What did you put on there?

Joe
03-11-2011, 11:25 AM
Oem replacements..bridgestone dueler alenza..275/55/20 I think. Factory rims.

thebigcomfy
03-11-2011, 12:37 PM
4 speed auto makes it tough to get better mpg even with afm

Moby1
03-11-2011, 01:02 PM
I just turned my 07 Tahoe Z71 in last week. I had it exactly 4 years and it had 137,000 miles on it. I never reset the average mpg computer in that time and it read 16.1mpg basically the entire 4 years.

Jonboater
03-11-2011, 01:13 PM
Yep same with our 07 LS 2wd. 16-16.5 is what it stays at all city driving in Dallas traffic.

Set the cruise at 70 and it pulls about 18. I have gotten as high as 23 without the cruise on the HW.

I believe these thing weigh around 6K. They aren't light weights.

Ackdog
03-11-2011, 04:18 PM
08 Suburban 1500 4 wh drive, 5.3 engine and 4sp tranny and I am at 17-19 MPG hwy and city combined.

Joe
03-11-2011, 04:22 PM
I doubt my vehicle would do 17-19 mpg with a tail wind.

Ackdog
03-11-2011, 04:44 PM
I switched from 20's to 17's.

propbender24
03-11-2011, 04:53 PM
I have recently been driving an 07' tahoe with active fuel management, 2wd, 275/55/20 tires (32"),

I have been getting 17 mpg in town, and she gets 20 mpg on the at 70 mph. I have actually been pretty impressed.

Ackdog
03-11-2011, 04:59 PM
Propbender, you pull the Fountain with the Hoe? :-))

NICE!!!

propbender24
03-11-2011, 05:18 PM
Propbender, you pull the Fountain with the Hoe? :-))

NICE!!!

Nope, I actually took the Tahoe in on trade for my previous '07 2500 hd. I am towing the Fountain with a new HD.

My wife said she wanted a Tahoe, but after driving it for a while she has decided that she prefers her Cadillac SRX. Go figure.

Here is a link to the Tahoe now for sale:

http://www.thehulltruth.com/fishing-miscellaneous-items/334876-2007-chevy-tahoe-clean-pics.html

Ackdog
03-11-2011, 05:30 PM
Both nice rigs! Good luck.

rljjredhed
03-11-2011, 05:36 PM
ethenal kills you mpg

me00351
03-11-2011, 05:48 PM
I have a 2007 Tahoe LTZ with 74,000 miles and I average 15-16 mpg overall.
Highway driving at 70 will get me about 19mpg.
Towing my 25' Proline was about 8-9 mpg and towing my 31' Yellowfin drops it to about 7-8 mpg.
This is my second Tahoe and now realize that I need to get a bigger truck to tow the bigger boat and I'm leaning toward a GMC/Chevy 2500.

weatherman
03-11-2011, 06:23 PM
I have a 2007 Yukon Denali XL (6.2l, 395 hp AWD) with the 6-speed auto. In country driving (2-lane, 45-55 mph) we get a tad over 16 mpg, and I've gotten almost 19 mpg on the 505 mile trip from Tennessee to Gulf Shores, AL. I also have a 2006 Silverado Vortec Max (6.0l 4x4 with the 4.10 rear end) and the 4-speed auto; same cycle, it gets 14ish, and 16 to Gulf Shores. The 6-speed auto is truly an improvement. On the Denali, the mileage computer is spot-on.

fireboat
03-11-2011, 08:54 PM
Weatherman, I have an 08 Yukon XL Denali with 2WD and you do better than me. I am normally very easy on the pedal but I still only average 13.5 on flat land here in Miami. The best I have gotten on the highway is 17. Still, I like it and plan on keeping it.

billinstuart
03-12-2011, 05:20 AM
It's all about mass and emissions...a clean exhaust AND good fuel economy are not synonymous. My 2007 2500hd regular cab with plastic bumpers and beer can sheetmetal for the body still weighs 5200lbs.

twobyfour
03-12-2011, 05:27 AM
We just traded in an 05' Escalade with the 6.0, we put 96k on it, and it has had 16.1 on the computer for years. Its hard to believe that suburbans are reporting about the same, yet your 5.3 Tahoe is about 3mpg less.. Something is out of whack.

charlie100348
03-12-2011, 11:42 AM
2006 5.3 Yukon hwy 19 in town 14 none of that "cylinder" management stuff and this is not towing.

Joe
03-12-2011, 02:06 PM
We just traded in an 05' Escalade with the 6.0, we put 96k on it, and it has had 16.1 on the computer for years. Its hard to believe that suburbans are reporting about the same, yet your 5.3 Tahoe is about 3mpg less.. Something is out of whack.

Well..it is what it is.

twobyfour
03-12-2011, 02:56 PM
Well..it is what it is.

My point was there may be something causing a problem with the mileage.. Could be a brake caliper sticking or a bad sensor, the computer might need to be rebooted or checked if different size tires were installed, the airflow might be disrupted somehow, any number of things..

Joe
03-12-2011, 03:32 PM
My point was there may be something causing a problem with the mileage.. Could be a brake caliper sticking or a bad sensor, the computer might need to be rebooted or checked if different size tires were installed, the airflow might be disrupted somehow, any number of things..

Not sure. I just replaced the orginal tires on it (with teh same same size/type/brand), and it's not pulling at all.

Air filter is clean, and oil is changed. Engine runs fine with no "check engine" lights. Just gets crap gas mileage.

John_Madison CT
03-12-2011, 06:28 PM
Joe: A couple years ago I posted about a "problem" with my Suburban. I changed the tires(same size and brand than original equipment) and lost 2 mpg. The advice I got here on THT was spot on. The new tires will take awhile to wear in. Within a few thousand miles, my mileage got better and finally returned to where it was before. Hope that helps.


John

Joe
03-12-2011, 08:15 PM
Joe: A couple years ago I posted about a "problem" with my Suburban. I changed the tires(same size and brand than original equipment) and lost 2 mpg. The advice I got here on THT was spot on. The new tires will take awhile to wear in. Within a few thousand miles, my mileage got better and finally returned to where it was before. Hope that helps.


John

Well we'll see. I hope so.

C Skip R
03-12-2011, 08:25 PM
I have an 07 Tahoe LT 4x4 with 81000 miles. Around town best I can get is 13-14. On a full tank on the highway I can squeeze out 15.3 mpg.

Joe
03-13-2011, 07:52 PM
I've pulled my boat a few times (maybe 30 miles..at most) and have about 200 miles on this tank of gas.

It's showing 12.3 mpg on the computer.

Highflier
03-13-2011, 09:07 PM
The computers can be very inaccurate.
Also, if you sit with the engine running, it really hurts mileage.
I used to work out of my diesel truck and would sit and idle no problem.
Barely affected the mpg. When I do that in my gasser, big hit on mpg.

I have a 2011 Suburban with 5.3, 6spd auto, 2wd and 3.42 gears.
I am seeing 18-20 highway and 14-16 in town.

chaco
03-13-2011, 09:46 PM
Highflyer, what are you pulling?
Do you have 4WD?

thank you for a reply -

-

Joe
03-14-2011, 06:25 AM
The computers can be very inaccurate.
Also, if you sit with the engine running, it really hurts mileage.
I used to work out of my diesel truck and would sit and idle no problem.
Barely affected the mpg. When I do that in my gasser, big hit on mpg.

I have a 2011 Suburban with 5.3, 6spd auto, 2wd and 3.42 gears.
I am seeing 18-20 highway and 14-16 in town.

As stated earlier. Calculating by hand and comparing to what the computer says is usually very close. I notice on a full tank anywhere from .1-.5 gallons burned ( what the gas pump says it takes to fill up) less than what the computer says.

I may change the rear diff fluid to synthetic and see if that helps any.

wstrickland1
03-14-2011, 06:40 AM
When I changed the tires on my Silverado the mileage dropped almost 2 mpg. The tires were the same size, not sure but I believe they were 265/55/20. Not sure if that's exact, that truck's long gone but it was the exact size that was on there. Went from the OEM Goodyears to Bridgestone HL Alenza or whatever they were.

I am constantly checking the mileage on the computer and noticed this the first few miles that I drove away from the tire store. It never really got better.

Joe
03-14-2011, 06:57 AM
I just think its weird that folks with the exact same vehicle are reporting 5-8 mpg better than what I get. And I drive like an old man and never get over 65-70!

Are these the same folks with the 20 mpg diesel duallies? ;)

twobyfour
03-14-2011, 10:37 AM
I just think its weird that folks with the exact same vehicle are reporting 5-8 mpg better than what I get. And I drive like an old man and never get over 65-70!

Are these the same folks with the 20 mpg diesel duallies? ;)

Actually, I have an 05' 2wd dually Duramax that gets about 22MPG unloaded. Gets between 10 and 14 MPG when I'm towing, depending on what I'm towing.. This is not out of the ordinary at all for diesels..

Joe
03-14-2011, 11:14 AM
Actually, I have an 05' 2wd dually Duramax that gets about 22MPG unloaded. Gets between 10 and 14 MPG when I'm towing, depending on what I'm towing.. This is not out of the ordinary at all for diesels..

Must be a locality thing..a buddy has a F350 dually and laughed when I asked him if he ever got 20 mpg. He said he normally sees about 13.

ALB
03-14-2011, 01:43 PM
I have an 07 Burb 4x4 with 75k on her and she is getting between 14-18mpg depending on how I drive and I drive the hell out of it most of the time. Towing yields me about 8mpg @ 5000lbs.

Tires are stock Goodyears on stock 20" rims.

wstrickland1
03-14-2011, 02:18 PM
I just think its weird that folks with the exact same vehicle are reporting 5-8 mpg better than what I get. And I drive like an old man and never get over 65-70!

Are these the same folks with the 20 mpg diesel duallies? ;)

I used to work with a guy that lived just outside of town, about 15 miles from the shop. If the temperature was 37 then at his house it was "in the 20's" (but he'd have a real number, like 28). If the temperature was 92 it was "over 100" at his place. He too got tremendous gas mileage on his vehicles. He paid much less for insurance than anyone I know and could get to Myrtle Beach (from Columbia) in 2 hours. He wasn't quite as cool as the Dos Equis dude but he was somethin' for sure.

Joe
03-14-2011, 04:06 PM
I used to work with a guy that lived just outside of town, about 15 miles from the shop. If the temperature was 37 then at his house it was "in the 20's" (but he'd have a real number, like 28). If the temperature was 92 it was "over 100" at his place. He too got tremendous gas mileage on his vehicles. He paid much less for insurance than anyone I know and could get to Myrtle Beach (from Columbia) in 2 hours. He wasn't quite as cool as the Dos Equis dude but he was somethin' for sure.

I've never read anyone on here that paid too much for a car, truck or boat..and everyone gets a free hull when they have a stress crack. :grin:

twobyfour
03-15-2011, 04:30 AM
Must be a locality thing..a buddy has a F350 dually and laughed when I asked him if he ever got 20 mpg. He said he normally sees about 13.

I'll post a pic of the computer reading later on when I get a chance.

ericinmich
03-15-2011, 06:48 AM
I'll post a pic of the computer reading later on when I get a chance.

If you do it right you can get it showing 99! Right after a reset, going downhill :)

Highflier
03-15-2011, 08:28 PM
I just think its weird that folks with the exact same vehicle are reporting 5-8 mpg better than what I get. And I drive like an old man and never get over 65-70!

Are these the same folks with the 20 mpg diesel duallies? ;)

In regards to my reply, I have a 6spd auto vs. the '07's 4spd.
Big difference...plus where are you driving?
I am in Texas where its easy to hit the open highway and drive 70 - 75 non stop for hours and it's basiclly flat. I am sure the mileage I see wont hold up in Denver, or any densely populated area. Food for thought.

Highflier
03-15-2011, 08:30 PM
Highflyer, what are you pulling?
Do you have 4WD?

thank you for a reply -

-

I don't pull anything of note with the Suburban (2wd).
I pull with a 2008 F-250 diesel CC 4x4.........mileage with the truck is about 13-14 hwy and 11-12 city.......on a good day......
Pulling a 27' Contender is about 6-7 hwy.......on a good day....

jsagan77
03-15-2011, 10:23 PM
08 Tahoe Hybrid 23 MPG's... Traded in my 2009 F250 SD and I'm seeing 100% better mileage. Definitely opens up some possibilities for a new boat =0)

Joe
03-16-2011, 07:48 AM
In regards to my reply, I have a 6spd auto vs. the '07's 4spd.
Big difference...plus where are you driving?
I am in Texas where its easy to hit the open highway and drive 70 - 75 non stop for hours and it's basiclly flat. I am sure the mileage I see wont hold up in Denver, or any densely populated area. Food for thought.

According to the window stickers...there is only a 1-2 mpg difference between the two vehicles. I'm driving in the flat low country of SC. More than half of my daily commute is highway speeds that I put on cruise control of ~ 60 mph..and almost get run over doing it.

Justaguy2025
03-17-2011, 06:03 AM
You should have the upstream O2 sensors checked. They may not be bad enough to set of the check engine light but could be getting lazy. The downstream ones should not make a difference. Noticed MPG's dropped on our Trailblazer and changed the upstream sensor and were back to 17MPG.

Jonboater
03-17-2011, 08:52 AM
I just think its weird that folks with the exact same vehicle are reporting 5-8 mpg better than what I get. And I drive like an old man and never get over 65-70!

Are these the same folks with the 20 mpg diesel duallies? ;)

Since this thread I have been checking the wifes tahoe everytime I hop in it, it is actually better then I reported at 16.5mpg average. Sometimes bounces up to 16.6mpg. She never resets the computer and almost never goes on the highway, trips are in Dallas, TX traffic.

As a matter of fact I do drive a duramax that gets 20mpg on the highway, it is a 2500HD not a dually.

Obviously you drive a lot more aggressive then you think you do or there is something off on your tahoe. Aggressive doesn't mean you drive fast, speed doesn't make that much difference in city driving. "Jack rabbit" starts are the killer for mpgs in a 3-ton vehicle.

wpruitt
03-17-2011, 12:02 PM
Joe, I am getting 15.5 average. It will get 19 on the highway...barely. Same setup as you but a subur-bus with 4wd. There is an art to getting better mileage and that is to coast as much as possible. It kicks in the cylinder management. How is your tire pressure?
W.

Joe
03-17-2011, 12:33 PM
I'm pretty diligent with tire pressures..all tires report 32 psi.

twobyfour
03-17-2011, 01:04 PM
If everything on the vehicle is operating properly and in tune, about the only thing I can think of would be that the engine wasn't broken in properly, and the piston rings didn't seat properly. Not sure what else it could be.

wstrickland1
03-19-2011, 05:24 AM
it's the tires I'm telling you. I don't what it is but that's why it changed all of a sudden. Mine did the exact same thing with the same tires you bought. Weird I know but that's it.

slayride
03-19-2011, 06:30 AM
07 yukon xl denali - 11.8 mpg

Joe
04-03-2011, 07:58 PM
lol..

260 mile round trip this weekend with about 95% highway miles, highest speed was 76 mph, probably averaged 72 on the highway..16.7 MPG.

This truck sucks...literally.

fldmax
04-04-2011, 07:54 PM
I'm pretty diligent with tire pressures..all tires report 32 psi.
Tighten them up. 40/42 psi will get ya better MPG:thumbsup: I had an 07 4x4 and 373 gears and after a good tune with HP TUNER I went from 15.2 to 16.8 all around. real # figured not a computer #. At 70 on the highway it did 18.5 at 63 it did 19.3 I have a 2010 4x4 with 6 spd and 342 gears. Just did the tune but before I did the tune it was 15.4 all around so far looks like 17.3 will be the new all around # and highway I can't say as I have not done that test yet. But before tune was 17.5 will see what happens after tune. I like the extra power so I am surprised it does as well as it does around town.



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