how to get better fuel mileage? - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



Welcome Enthusiast! If you already own a Chevy TrailBlazer or GMC Envoy or perhaps thinking of purchasing such a vehicle, then you have come to the best TrailBlazer and Envoy site on the net! Rainier, Bravada, Ascender, and 9-7x owners welcome too!

You are currently viewing our site as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to search and post topics, communicate privately with other members, respond to polls, upload content, and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.
Join Today!
Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > Engine Tunes/Mods

Engine Tunes/Mods Performance Engine Tuning/Engine Modifications

TrailVoy.com is the premier GMC Envoy Forum on the internet. Registered Users do not see the above ads.
Reply
 
Thread Tools
  #1  
Old 07-20-2011, 09:03 PM
motley403 motley403 is offline
Junior Member
 
2007 Chevy TrailBlazer LS
Moondust Metallic 4.2L I6 4X4
Join Date: Jul 2011
Location: Nebraska
Posts: 8
how to get better fuel mileage?

We like our trailblazer but thought about trading it in for a car with better fuel mileage. What are the best ways to gain fuel mileage? Cheap and easy ways to increase mileage would be nice, but I am wondering what all a guy can do to help it. How much better can these TB's get for mileage? Ive thought about a CAI or a tune, but wondered if there were cheaper alternatives or better ones. Or are those the best ways to do it for the money? Any info would be greatly appreciated. I am going on a big road trip soon and would like to get the most out if it that I can. Thanks.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 07-21-2011, 12:20 AM
ahabofthepequod's Avatar
ahabofthepequod ahabofthepequod is offline
Member
 
2008 Chevy TrailBlazer LT
Black Granite Metallic 4.2L I6 2WD
Join Date: Dec 2007
Location: Dearborn, MI
Posts: 476
I've owned cars, SUV's and pick-up trucks.

Mileage (when I was younger) wasn't too important. As I've aged I found that I do a lot of things that require a vehicle that can carry stuff.

Granted I could probably fit my stuff into a car but then It's a matter of how easy and quickly can I load/unload my vehicle.

My TB is the I-6, 2wd with the 3:42 gears. I can easily get 21mpg on the highway with the AC on. Personally I am satisfied with that mileage considering everything else I get with the vehicle (comfort, acceleration, sound system, etc...).

Changing your driving pattern, keeping your tires properly inflated, maintaining your suspension are inexpensive ways to improve mileage.

I have a CAI but no other mods. A tune of the computer can improve shift points and give you a bit more mileage.
Reply With Quote Quick reply to this message
  #3  
Old 07-21-2011, 09:21 AM
Doc Brown Doc Brown is offline
Senior Member
 
2003 Chevy TrailBlazer LT EXT
Dark Green Metallic 4.2L I6 4X4
Join Date: Oct 2006
Location: Milwaukee, WI
Posts: 967
Oops! Duplicate post. Sorry.
Reply With Quote Quick reply to this message
  #4  
Old 07-21-2011, 09:22 AM
Doc Brown Doc Brown is offline
Senior Member
 
2003 Chevy TrailBlazer LT EXT
Dark Green Metallic 4.2L I6 4X4
Join Date: Oct 2006
Location: Milwaukee, WI
Posts: 967


Its a truck, plain and simple. Even with a tune, at best it'll still be under 25 mpg on the freeway.
Reply With Quote Quick reply to this message
  #5  
Old 07-21-2011, 11:48 AM
playstrings playstrings is offline
Member
 
2003 GMC Envoy SLT XL
Pewter Metallic 5.3L V8 4X4
Join Date: Dec 2008
Location: Ottawa Canada
Posts: 166
LOL - buddy said he was looking at trading to get better gas mileage. When I asked him how much more his monthly payment would be and if he would save that in gas, he looked at me kind of lost.

Mine is paid for, I will run it as long as I can cause fixing it and paying a bit more in gas, is far cheaper than buying a new one.

Now if you are commuting a long way and you are going down to a real gas mizer. Different story. Over time this is reasonable. I would have the Envoy for serious travelling and a beater to commute.

Good points above on keeping things tuned up to optimize your mileage. Look at putting a few more pounds of air in your tires to decrease rolling resistance.
Reply With Quote Quick reply to this message
  #6  
Old 07-21-2011, 01:10 PM
limequat limequat is offline
Senior Member
 
1987 Non-GMT360 Other
n/a 4.2L I6 2WD
Join Date: Apr 2008
Location: Detroit
Posts: 808
Some things I've personally found:

Run smaller wheels/tires
Overinflate your tires
Drive 65 on the freeway instead of 85
Increase your AFR to ~17:1 for cruise/idle
Make sure your injectors are clean
Reply With Quote Quick reply to this message
  #7  
Old 07-21-2011, 03:42 PM
ylab's Avatar
ylab ylab is offline
TrailVoy Alumni
 
2002 GMC Envoy SLT
Summit White 4.2L I6 4X4
Join Date: Jul 2005
Location: Stratford, NJ
Posts: 3,200
I've have or have tried most of the modifications that are supposed to help mileage and there are all of three that yield a measurable gain.

1) TUNE, TUNE and TUNE! - Purse and simple, that's the easiest and one of the two best modifications for mileage. (You do need to relearn driving the truck with the tune, if you're constantly using the newfound efficiency/power, you're mileage isn't going to be helped).

2) E-Fans, this was the other only substantial gain and raised my mileage 2-3 mpg. This yields more of an increase than the TUNE, yes, I said it, it helped more than my tune did. Take note that there is some work involved in going from the mechanical clutch to a e-fans. You'll need to be hand and be capable of fabricating some brackets in many cases.

3) Tires! - Different tires roll easier than others. The stock Michelin actually gave me higher highway mileage than my Hankooks do, same size, same rims....in my case, the better traction and grip far outweights the 3/4 mpg loss on the highway. Before I got tired of switching from summer to winter wheels, I had a set of 20s with Hankook Ventus tires, they actually gave better mileage than the stock Michelins did. - Go figure, more than twice the weight, but slightly better mileage.

An intake and exhaust help every so slightly and sure aren't going to give you any sort of payback or break-even. I love my Borla and CAI, gives a nice growl/tone when you get going, but realistically I saw no obvious mpg increase.....there was a little power increase, but at the higher rpms, which don't help mileage. - Yep, she'll scream like a banchee and take off when pushed, but neither really helps your mpg.

The Airaid spacers are junk, just add an annoying whistle at low throttle....don't bother, waste of $90.
__________________
Borla Exhaust, CAI, e-fans, Wester's Tune, MarkMc's lift & Z71 Shocks!
Reply With Quote Quick reply to this message
  #8  
Old 07-21-2011, 03:47 PM
irwinmb5's Avatar
irwinmb5 irwinmb5 is offline
Junior Member
 
2003 Chevy Trailblazer LS, 138K
Summit White 4.2L I6 2WD
Join Date: Jan 2010
Location: West Ashley, SC
Posts: 95
ylab- what does your mpg's look like with your mods?
__________________
quad high beams, drl killer, bugshield, vent visors, orange bowtie
Reply With Quote Quick reply to this message
  #9  
Old 07-21-2011, 09:14 PM
ahabofthepequod's Avatar
ahabofthepequod ahabofthepequod is offline
Member
 
2008 Chevy TrailBlazer LT
Black Granite Metallic 4.2L I6 2WD
Join Date: Dec 2007
Location: Dearborn, MI
Posts: 476
3) Tires! - Different tires roll easier than others. The stock Michelin actually gave me higher highway mileage than my Hankooks do, same size, same rims....in my case, the better traction and grip far outweights the 3/4 mpg loss on the highway. Before I got tired of switching from summer to winter wheels, I had a set of 20s with Hankook Ventus tires, they actually gave better mileage than the stock Michelins did. - Go figure, more than twice the weight, but slightly better mileage.

Tires are a big part of mileage.

Tires that get better traction have a softer tread compound and get slightly lower mileage than a harder compound.

Make sure that the speedometer is set for the "actual height" of the tires.
While you may see tires labled with the same size for your TB there can be a difference in the "actual height" of the tires. Think I'm wrong go to your local Sam's club and compare the height of tires of the same size from different makers.

Also a softer tread compound will give better traction but that can result in less mileage and a shorter tire life span.
Reply With Quote Quick reply to this message
  #10  
Old 07-22-2011, 02:14 PM
Big Jim 2003's Avatar
Big Jim 2003 Big Jim 2003 is offline
Member
 
2003 Chevy TrailBlazer LT EXT
Dark Gray Metallic 4.2L I6 4X4
Join Date: Nov 2009
Location: Thorold Ontario Canada
Posts: 210
2 stroke oil

I recently ended up on a Corvette Forum and was interested to find that some members have been experimenting with adding 2-cycle oil to their fuel.They had done alot of testing and found that the oil helped MPG and worked as a cleaning and upper cylinder lube.The ratio that they found worked best, turned out to be 1oz. per 5 gallon of gas.I found this interesting and plausible.When I used to own snowmobiles,sometimes I would use up premixed fuel,by pouring it in my van and the van seamed to like it.The original concern of the corvette guys was that todays unleaded fuels were hard on their engines and they were looking for a solution.When they took the heads off they say that the oil had cleaned up deposits and left a fine film of oil on these parts.They found that because the mix ratio is something like 500/1 that it will not hurt their cats. THE ONLY WARNING WAS TO USE TCW3 RATED OIL,because it has very low ash when burnt,this is usually a marine 2-cycle oil.

PS> If you try this be sure to stick with the 1oz.per 5 gallon ratio.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum forums, you must first register.

Please enter your desired user name, your email address and other required details in the form below.
(Only letters, numbers, dashes and underscores are permitted for user names)
The user name that you choose is permanent and can never be changed.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


» Sponsors

Advertising Info

All times are GMT -4. The time now is 06:23 AM.


Chevy TrailBlazer and GMC Envoy Enthusiasts - Copyright 2004 - 2009 All Rights Reserved.
All trademarks referenced herein are property of their respective owners.
RSS Feed