Home Resources Forums Nationals Meets Store
08/22/14 04:35 PM *
Welcome, Guest. Please login or register.

Login with username, password and session length
News: Welcome to the Chevy Avalanche Fan Club of North America

Become a Supporting Member

Visit the CAFCNA General Store

 
   Home   Help Search Login Register Bookmark  
Advertisement
Put your advertisement image here...


Advertisement
 
Pages: [1] 2 3 4 5  All   Go Down
  Print  
Author Topic: Gas milage killing me. Any suggestion to Improve  (Read 43102 times)
0 Members and 2 Guests are viewing this topic.
green
New Member
*
Offline Offline

Posts: 8


Awards
« on: 07/14/06 07:54 AM »

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?
Logged

05 Bermuda Blue LT Z-71 Loaded, Mannik SS grille guard
RichUF
CAFCNA 2005 Supporting Member
Full Member
*
Offline Offline

Posts: 10,631


UNP1MPD


Awards
« Reply #1 on: 07/14/06 07:58 AM »

my coworker with an '05 Z71 gets nearly 20 on his commute.

The 4.10 gears are not helping you I suspect.

The first, and possibly only non-negligible change would likely be from changing  how you drive.  Ease up some and see if it helps.
Logged

[sig deleted by Admin...your account is next to go]
ygmn
Administrator
Full Member
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
Offline Offline

Posts: 31,390


Insert Funny Text Here _______________ .


Awards
« Reply #2 on: 07/14/06 08:03 AM »

do not smash gas pedal ...

Baby it..
drive like granny...

put brick under gas pedal...hehehe
Logged

Thread Killer ... After I post they die?
2002 Pewter Z66 - Sept 2001
CAFCNA Album
LSU BABY!
YANKEES BABY!
SAINTS BABY!
HuntOhio
Full Member
***
Offline Offline

Posts: 148


Warning...My Avalanche actually goes off road.


WWW Awards
« Reply #3 on: 07/14/06 08:07 AM »

I am not sure about the gearing issue?  I get around 15 mpg city and around 20mpg on hwy.  This is with very easy driving without stomping at every light and using cruise control every chance I can.
Your mileage seems bad...I am looking into a inexpensive mod to change to a K&N air filter and maybe a new computer chip.  These can always be changed back and should not hurt the warranty.  Also it is fairly inexpensive to do.
My mechanic told me I should pick up 3 miles per gallon doing this.
Have you checked your tire pressure lately?
Logged

2002 Z71, Pewter, numerous factory options, amber DRLs, vent visors, 4 fender mod, future treated cladding, four on high.
RichUF
CAFCNA 2005 Supporting Member
Full Member
*
Offline Offline

Posts: 10,631


UNP1MPD


Awards
« Reply #4 on: 07/14/06 08:08 AM »

...My mechanic told me I should pick up 3 miles per gallon doing this.
Have you checked your tire pressure lately?

Don't count on a 3mpg increase.

the tire pressure is a very good point, however.
Logged

[sig deleted by Admin...your account is next to go]
MS03 2500
CAFCNA 2014 Supporting Member
Full Member
*
*
*
*
*
*
*
*
*
Offline Offline

Posts: 31,858


Awards
« Reply #5 on: 07/14/06 08:21 AM »

I agree with the K&N air filter I have a AEM Brute Force and I make a world of difference, I drive mainly on roads above 50 mph and it seems to be around 16-18 mpg. In stop and go traffic it not noticeable at all. I have the 2500 and I think thats good.
Logged

2003 2500
green
New Member
*
Offline Offline

Posts: 8


Awards
« Reply #6 on: 07/14/06 08:29 AM »

I do baby this ride. I drive 14 miles to work, takes about 25 min. I have even asked dealership if something was wrong? response it is within range.
Logged

05 Bermuda Blue LT Z-71 Loaded, Mannik SS grille guard
ygmn
Administrator
Full Member
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
Offline Offline

Posts: 31,390


Insert Funny Text Here _______________ .


Awards
« Reply #7 on: 07/14/06 08:31 AM »

I do baby this ride. I drive 14 miles to work, takes about 25 min. I have even asked dealership if something was wrong? response it is within range.
well that is avg speed of 33.6 mph which is city driving....

so I bet lots of stop and go...which is when you will get crappy mpg...
Logged

Thread Killer ... After I post they die?
2002 Pewter Z66 - Sept 2001
CAFCNA Album
LSU BABY!
YANKEES BABY!
SAINTS BABY!
FlaBouy
Full Member
******
Offline Offline

Posts: 5,937


Awards
« Reply #8 on: 07/14/06 08:38 AM »

Tune, CAI, and exhaust mods will get you 2-3 mpg....Seen it a lot....the tune will be the best in the bunch... I was seeing 17-18 mpg on my 04 z-71 with the blower, 42# injectors and stock motor.... with stock injectors and a custom tune, 17 hwy should be easy....if you drive easy...

around town....fuggittaboutit...... Cheesy
Logged
FAME2002
Full Member
***
Offline Offline

Posts: 423


Awards
« Reply #9 on: 07/14/06 09:07 AM »

When I accelerate in my avy, I keep the RPMS under 2000, its very slow to accelerate, but it really helps the gas mileage, the lower your rpms the less gas youre going to use, when getting on the highway or wherever you just have to accelerate as slow as possible. The people behind you will hate you....but theyre not paying for your gas!
Logged
FlaBouy
Full Member
******
Offline Offline

Posts: 5,937


Awards
« Reply #10 on: 07/14/06 09:10 AM »

When I accelerate in my avy, I keep the RPMS under 2000, its very slow to accelerate, but it really helps the gas mileage, the lower your rpms the less gas youre going to use, when getting on the highway or wherever you just have to accelerate as slow as possible. The people behind you will hate you....but theyre not paying for your gas!

Good pointer......

Hehe....I am trying to remember the last time I could keep my rpm's below 2000......

hard to do with a 2600 stall....... of course I quit worrying about gas mileage a long time ago.......
Logged
farmguy
CAFCNA 2005 Supporting Member
Full Member
*
Offline Offline

Posts: 2,655


Don't Mess with Texas


Awards
« Reply #11 on: 07/14/06 09:15 AM »

While there are a number of mods you can do that will marginally increase mpg, the most significant is change your driving habits. Use the cruise, slow down, easy on the gas, don't touch the brake unless you absolutely have to.

But the bottom line is don't buy an Avalanche for fuel economy. If that's your priority get a Civic or a Prius. If you want to enjoy the advantages of the AV, you gotta pay to play.
Logged



'06 LT. Texas Bowtie, Jayhawk Hitch cover,  Amber DRLs, Magellan GPS, backup cam, Line of Fire, Chrome letter overlays, Cherry Bomb Glasspack, Bowtie Exhaust tip,Vent Visors, Bug Shield, Billet Grille, Halo Headlights, dark tinted windows, Sail panel LED's, Backup Sensors. Chrome 20's.
DESERTAV
Full Member
******
Offline Offline

Posts: 2,231


Got Birds?


Awards
« Reply #12 on: 07/14/06 09:25 AM »

I have a 65 in lift running 35 and I get about 15.5 city and 20 highway.  I changed my air filter to a K&N cold air induction and I am running a Hypertech power programmer.  Those 2 mods should help out a lot. Check the tire pressure it can kill your mpg
Logged

2003 Z71 WBH,  Superlift FIT lift and 3 inch Body Lift, 37 Inch Toyo Mud's, 4:88 Gears,AEM cold air intake, Superchips programmer,And the almighty Buck Stop Pre-runner Bumper, Ram Air hood, and too much else to list!
FlaBouy
Full Member
******
Offline Offline

Posts: 5,937


Awards
« Reply #13 on: 07/14/06 09:37 AM »

I have a 65 in lift running 35 and I get about 15.5 city and 20 highway.  I changed my air filter to a K&N cold air induction and I am running a Hypertech power programmer.  Those 2 mods should help out a lot. Check the tire pressure it can kill your mpg


I would love to see that 65" lift..........
Logged
RichUF
CAFCNA 2005 Supporting Member
Full Member
*
Offline Offline

Posts: 10,631


UNP1MPD


Awards
« Reply #14 on: 07/14/06 09:40 AM »

what's your cruising speed over those 14 miles to work?  Interstate @ 70?

hate to say it, but 55-60 would help you out.

My 14 mile cruise to work in my '03 AV got me about 14 or 15.  About all I was using AV for 99% of the time, which is part of why I got rid of it Undecided
Logged

[sig deleted by Admin...your account is next to go]
MrJim
CAFCNA 2003 Supporting Member
Full Member
*
Offline Offline

Posts: 501

Avatar? I thought you said "Have a Car"?


Awards
« Reply #15 on: 07/14/06 10:08 AM »

Green,

I have a similar commute thru town - 12 miles (each way) and 18 (yes, 18!) traffic lights! banghead A normal week will also see me put about  40-50 highway miles on he clock.  Normal weekly gas mileage is about 15 MPG veryveryangry .  Last month, my volunteer work took me out some country highways as well as the interstate and I got nearly 21 MPG.  My conclusions:

1. Our beloved AV is not optimized for city commuting.

2.  Big trucks with (relatively) big engines will not get stellar gas mileage, regardless.

3. Little cars with little engines will always get better gas mileage.

4. Little cars are easiled smushed by big trucks.

5. I don't want to get smushed.

It's kinda like death and taxes, except you do get some choice.


MrJim
Logged

'03 Summit White 1500 4x4. Amber's, Silverstars, 50w backups, Bugflector II, WeatheFlectors, Club Decal, more...
ygmn
Administrator
Full Member
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
Offline Offline

Posts: 31,390


Insert Funny Text Here _______________ .


Awards
« Reply #16 on: 07/14/06 10:13 AM »


1. Our beloved AV is not optimized for city commuting.

2. Big trucks with (relatively) big engines will not get stellar gas mileage, regardless.

3. Little cars with little engines will always get better gas mileage.

4. Little cars are easiled smushed by big trucks.

5. I don't want to get smushed.

It's kinda like death and taxes, except you do get some choice.


MrJim
that was well put .....hehehe
Logged

Thread Killer ... After I post they die?
2002 Pewter Z66 - Sept 2001
CAFCNA Album
LSU BABY!
YANKEES BABY!
SAINTS BABY!
DESERTAV
Full Member
******
Offline Offline

Posts: 2,231


Got Birds?


Awards
« Reply #17 on: 07/14/06 10:25 AM »

Sorry made a typo its a 6 in lift  Big laughter with tears Big laughter with tears Big laughter with tears Big laughter with tears Big laughter with tears
Logged

2003 Z71 WBH,  Superlift FIT lift and 3 inch Body Lift, 37 Inch Toyo Mud's, 4:88 Gears,AEM cold air intake, Superchips programmer,And the almighty Buck Stop Pre-runner Bumper, Ram Air hood, and too much else to list!
green
New Member
*
Offline Offline

Posts: 8


Awards
« Reply #18 on: 07/14/06 11:19 AM »

Ok, I am not a dumb A$$. I did not expect to get great MPG or I would have bought a small car. My last vehicle was a Chevy Crew 4X4 and it got close to 15.5 on the same commute. I would hope this one would be the same. AS for air pressure, I keep it serviced at the dealership. I wonder if the grille guard is affecting the dynamics. Does a K&M filter make a real difference, I saw the show on Dateline NBC that did not show any after market stuff helping any truck?
I have tried the 55 mph and it made no real difference in overall fuel economy on a tank of gas because I am only on the Hi way about 3 miles each way.
I love my slut but when gas gets to $4.00 per gallon love will fade fast, and we all know that $4.00 is not that far away.
Logged

05 Bermuda Blue LT Z-71 Loaded, Mannik SS grille guard
RichUF
CAFCNA 2005 Supporting Member
Full Member
*
Offline Offline

Posts: 10,631


UNP1MPD


Awards
« Reply #19 on: 07/14/06 11:25 AM »

If I were doing what you describe and getting the mileage that you report, I'd take it back to the service department and complain some more.
Logged

[sig deleted by Admin...your account is next to go]
HuntOhio
Full Member
***
Offline Offline

Posts: 148


Warning...My Avalanche actually goes off road.


WWW Awards
« Reply #20 on: 07/14/06 11:45 AM »

On a city commute I do not think the K&N filter would help you all that much.  A different computer chip may not help all that much either.  You may pick up 1MPG.
You would see the biggest difference on a hwy drive.
I also do not agree with all these guys that make mods to their exhaust and say they get all this extra power and killer gas milage.  These modern engines need the back pressure to run efficiently.
Logged

2002 Z71, Pewter, numerous factory options, amber DRLs, vent visors, 4 fender mod, future treated cladding, four on high.
FAME2002
Full Member
***
Offline Offline

Posts: 423


Awards
« Reply #21 on: 07/14/06 11:49 AM »

If I were doing what you describe and getting the mileage that you report, I'd take it back to the service department and complain some more.

I agree-
I can drive my 05 avy like a corvette, stomping on the gas, and I get 14-14.5mpg.  If youre getting 12-12.5 something is wrong.
Logged
ygmn
Administrator
Full Member
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
Offline Offline

Posts: 31,390


Insert Funny Text Here _______________ .


Awards
« Reply #22 on: 07/14/06 12:00 PM »

How are you figuring your MPG?

The computer thingy on dash?

or

Divide miles driven on tank by amount of full fuel fill??
Logged

Thread Killer ... After I post they die?
2002 Pewter Z66 - Sept 2001
CAFCNA Album
LSU BABY!
YANKEES BABY!
SAINTS BABY!
green
New Member
*
Offline Offline

Posts: 8


Awards
« Reply #23 on: 07/14/06 12:25 PM »

I am using both the computer on the dash as well as fuel fill up to miles math.
Logged

05 Bermuda Blue LT Z-71 Loaded, Mannik SS grille guard
FlaBouy
Full Member
******
Offline Offline

Posts: 5,937


Awards
« Reply #24 on: 07/14/06 12:57 PM »

On a city commute I do not think the K&N filter would help you all that much.  A different computer chip may not help all that much either.  You may pick up 1MPG.
You would see the biggest difference on a hwy drive.
I also do not agree with all these guys that make mods to their exhaust and say they get all this extra power and killer gas milage.  These modern engines need the back pressure to run efficiently.


A-h-h-h-h a pessimist....would you believe actual log data from the HP Tuners datalogs that show increased airflow from certain mods including exhaust, CAI, power adders, etc... while driving in real world conditions, and not on a dyno...? Couple that with dyno charts to prove the power, and simple math to figure out gas consumption....

A good tune will increase your mpg from stock levels about 2-3mpg on the highway... Look up a posting on this site by a guy named farmtruc..... He is a professional tuner that also owns an AV..... he has tuned his own 2005 AV to get 19.1 mpg....

BTW with 19.1 mpg his bolt on mods get him the following at the track:

2.12 60'
8.99 1/8
79.77mph 1/8
13.93 1/4
97mph 1/4

Not bad for a inefficient 5800 lb truck in my opinion....  the ultimate "exhaust mod"............

BTW don't take my word for it........

http://www.chevyavalanchefanclub.com/cafcna/index.php/topic,63586.0.html



« Last Edit: 07/14/06 01:04 PM by FlaBouy » Logged
Pages: [1] 2 3 4 5  All   Go Up
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.19 | SMF © 2006-2011, Simple Machines Valid XHTML 1.0! Valid CSS!
Page created in 0.079 seconds with 22 queries.
Official SEMA Member ChevyAvalancheFanClub website are the rightful owners as indicated in the ALT TXT tags provided.  Chevrolet, Chevy, Avalanche, PRO-TEC, PASSlock, Midgate, the Chevrolet bowtie logo, Avalanche logo, and their images are registered trademarks of the General Motors Corporation and are used with kind permission as approved by Chevrolet Public Relations, Chevrolet Brand Management, and the Chevrolet Legal Department (thanks Chevrolet!).  OnStar and it's logo are the property of OnStar.  XM, XM Radio, and the XM logo are property of XM Radio.  I'm just a little guy so don't even think about suing me.  It's recommended you read the Privacy Policy and Terms of Use of this website.  The Chevrolet Avalanche Fan Club of North America is a proud member of SEMA, the Specialty Equipment Market Association.  All content appearing on this is protected under international copyright , 2002 to 2008, All Rights Reserved