Gas milage killing me. Any suggestion to Improve

[MS03 2500]

Another thing you may want to try, (I know everyone is going to said it doesn't matter) I assume you are not running the AC, drive without the back window in
I feel in mine it makes the truck more stable and I feel it makes the truck more aerodynamic and it's a lot cooler inside.

  This is my seat of the pants gut feel

[ygmn]

drive with out AC... 

you have never been down south before...hehehe

you would melt without AC...hehehe

[FlaBouy]

NO A/C...... 




hehe j/k

You know though.....GM did have a reason for making the rear glass removable.....

[MS03 2500]

I guess in Florida the rear glass thing may not be a good idea but maybe at night or early in the morning you may want to give it a try. I did it today but in Michigan
it's only 90 degrees and 64% humidity

[green]

Why have a slut. Should have bought a Work Truck if you want to ride around with windows down.

[FlaBouy]

Why have a slut. Should have bought a Work Truck if you want to ride around with windows down.

Ouch.....

I think I am going to like this guy.......

[EricB]

If you like the without rear window idea, I'm working on a screen that can't be cut with a knife to go in there!  I'll post some pics when I get it done.  Should be in the next week or two.

[DanGTO]

Another thing you may want to try, (I know everyone is going to said it doesn't matter) I assume you are not running the AC, drive without the back window in
I feel in mine it makes the truck more stable and I feel it makes the truck more aerodynamic and it's a lot cooler inside.

  This is my seat of the pants gut feel

Back window out is nice, if you go down the highway etc.  City, too much of a hassle, especially in Southfield 

I am in Southfield now.  Black 02 + ambers..

[black jack 05]

well on my 02 i got 20 mpg highway now thats with afe intake, throttle body spacer  bosch pat plus 4 plugs and corsa cat back and with ac off.  now on my 05 ive been getting 19mpg highway and with afe intake tire psi at 40 and ac off. i drive the speed limit. now the only other dif between the two besides mods is rear 02 has 375 and 05 has 3:42 . now i know all you are asking florida and not running ac , well i leave for work at 6am cool outside and run the fan with reci on and come home at night.

[ygmn]

Still hot out any time of day & humid too..

AC baby is more then worth loss in MPG...for me

[ak_abes]

now i know all you are asking florida and not running ac , well i leave for work at 6am cool outside and run the fan with reci on and come home at night.

On the '05 doesn't the A/C come on with the recirc?  I thought I read that in the manual.

I have an '05 with CAI, performance muffler (AT3030), stock small rear end.  I have a 12mi commute, mostly highway 70 mph.  Average 17.5 with A/c on.

[O_Baterisssta]

I have an 06 WBH 2wd. Intake and flowmaster 40 dual exhaust are my only mods so far. It kinda depends on where you live also. I live in a 'suburb' of Los Angeles, and it's kinda hilly I guess. I get about 17-18mpg both highway and city. I drove to Vegas between 75-80mph and got about 19-20mpg. I'm not really heavy on the pedal, only if I want to be  or if a cute girl is stopped right next to me.

[cadboy1]

Maybe the gas mileage finally killed him..He never posted again

[GPM1972]

I've got an 02 Z71 with 4.10s.   I've got nearly 80,000 miles on the clock,  About 10,000 miles ago I switched from Penzoil 5W30 to Mobil 1 5W30 and picked up an overall average of 2 mpg.  Most notable on the interstate where I've gone from less than 16 mpg @ avg. 80 mpg to over 19 mpg.

[StanW]

You might also want to change the oil to synthetic. I put in Mobil One 5W30 and went from 14.5 to 16 MPG. Not much improvement considering the cost of synthetic, but every little bit helps

Hope this helps.

[AVLT05]

 I noticed a 1 to 1.5 mpg increase when I switched to Mobil 1 as well.

[Norcal]

Buy  an H2 - and you will really appreciate the AVs gas mileage... Seriously - I'm getting about 18MPG on average. 2006 LT 4x4... Suggest Tru Flow intake, and Corsa sport Exhaust. I also tuned mine with the plug in tuner - set to extract mileage and change tranny shift points. Tow/Haul overides back to stock. Goes faster - sounds bad ass...
Good Luck!

[AlpineNInfinity]

1500 av Z-71 with 4.10 gears. Still stock other than grille guard and F Keys. Averages 12.5 miles per gallon all around. Can get 15 while on hi way. Gas prices going up, love my truck but cost too much to drive. Any suggestions to improve fuel econ without messing up warranty? Is 12.5 a good average with this setup?

Get a civic.

[StClairDean]

Firstly, this is an awesome forum and a very valuable resource. 

About 2 months ago, I picked up my 04 Av (5.3, 410) and about 23k miles.  I have been watching closely the fuel mileage and am getting somewhat discouraged.  Obviously, as the vehicle is relatively new to me, I don't really have much data to go on, but my average is about 11 mpg.  And believe me, I baby my Av.  Mostly city driving which I know kills mpg.  If I can't squeeze any more mileage out, I will definately be looking at mods or a tune.  Perhaps it's buyer's ignorance, but the last Chevy trucks I had (1990, 350 3/4 ton and a 2001 5.3 1/2 ton) both averaged 17-19 mpg.  With the newer Av (improved technology), I expected the mileage to be somewhat similar.  I was obviously mistaken.

Cheers

[MyBigToy]

The worst I've done is 12.4 and the best I've done is 17.5. I average about 15 and don't think that's too bad considering what I'm driving.

I'm sorry but if you are concerned about gas mileage you shouldn't be driving a big-a$$ed truck.

[cooldoctor1]

 

My wife drives a 2007 short (not ext) GMC Yukon and gets 15 mpg average, and we live in flat midwest with mostly open (highway-like) driving.  She has a Vortec 6.2 L stock GM engine (larger due to Denali). 

I am readying to purchase a 2007 Av AWD  5.3 L and during a prolonged test drive, noticed the famous V4-V8 engine (forget what it's called) really, as others have said, does not go to V4 unless I am totally with foot off pedal.  On flat highway, still V8.  Question why, like the 4WD, I cannot simply dial it down to V4 at my discretion.  THAT would save some petrol.

Interesting thread.

[SilverGhost]

I commute 120 miles/day and can drive 25% of it in V4 mode.  I average 45 mph, so there is a fair share of city driving and I am getting 17-19.  I do not believe in the slow and easy starts.  I have tried that and I seem to get worse mileage.  I stomp on it and get up to 45-50 (usually in 2nd), back off and kick in the cruise around 60.   On the highway (10 miles) I set the cruise at 70.  On the hilly sections I sometimes turn off the cruise to try to stay in V4 mode.  I have also experimented with and w/o the AC it costs me on average 2mpg.  I also try to minimize the amount of time I run the defroster.  With all that being said when my wife drives the AV for her commute she gets 15-17 with less city driving.  I really think it boils down to driving style, how close do you follow the vehicle in front of you.  I run my tires at 38psi, 3.73 gears, 63 Series K&N and a Flowmaster 50 DeltaFlow. 

I did read a post by GMResearch where they are thinking of putting in a low, medium and high V4 mode selector, in the future.

[otisroundtree]

I don't think it's practical to drive an SUV or truck and worry about the gas mileage, you probably should by an econo car if gas mileage is your main concern.  I say step on it!

[MS03 2500]

Congrat's  on the first post otisroundtree, very well put

to the club 

[kcole683]

People always told me if you're worried about the gas mileage then you can't afford the truck. .. .... .
....................................

Obviously I can't afford my truck !!!!

I have a cure though it's a 17 year old beat up work car that gets twice the fuel mileage.