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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

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  #1  
Old 01-05-2012, 01:25 PM
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JayPizzle JayPizzle is offline
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2005 GMC Envoy SLE
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Improving Gas Mileage

Whats up everybody!

Im a new guy on here and im just looking for some ways to improve gas mileage. Im looking for ideas beyond the basic tune ups or keeping tires inflated.

Thanks guys!
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  #2  
Old 01-05-2012, 02:33 PM
fire06 fire06 is offline
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I have found that if you do not drive with a heavy foot the mileage is not to bad. I run my whole truck on amsoil and my mileage is not terrible.
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  #3  
Old 01-05-2012, 03:57 PM
TrailblazrI6 TrailblazrI6 is offline
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Quote:
Originally Posted by JayPizzle View Post
Whats up everybody!

Im a new guy on here and im just looking for some ways to improve gas mileage. Im looking for ideas beyond the basic tune ups or keeping tires inflated.

Thanks guys!
The only way that Ive found to get better mpg's in these trucks, is to trade it in for a Prius

The size, weight, body over frame, powerplant, older transmission and solid rear axle - just to name a few - will not allow you to get any better than 23mpg avg on the highway AT BEST. And that is based on a 2 wheel drive I-6 truck, NON extended.

You dont even want to discuss city mileage. The best city mileage Ive ever got in after owning my TB for 10 years was 16mpg. The best highway mileage Ive ever got was 20mpg, with the cruise set at 65mph. Anything over that, in my experience, and the mileage tanks incremently.

If you wanted good mpg's, you bought the wrong vehicle.
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  #4  
Old 01-05-2012, 04:12 PM
MILLION-MILES MILLION-MILES is offline
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An engine is basically an air pump. The easier you make it for air to go in and come out the less gas it needs to make that happen. An intake with better flow over stock and a better flow exhaust over stock are ways to make this happen. Run low rolling resistance tires ( got 2mpg on my durango with a set).
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  #5  
Old 01-05-2012, 05:29 PM
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Quote:
Originally Posted by JayPizzle View Post
Whats up everybody!

Im a new guy on here and im just looking for some ways to improve gas mileage. Im looking for ideas beyond the basic tune ups or keeping tires inflated.

Thanks guys!
How about figuring what kind of mileage your getting now (using the miles driven divided by the gallons used method) and report back. You may be getting great mileage and don't realize it. These trucks are 4300lbs....they aren't gas sippers.
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  #6  
Old 01-05-2012, 06:51 PM
Loverotties Loverotties is offline
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Buy a flatbed and put your TV on it.
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  #7  
Old 01-05-2012, 09:57 PM
Loverotties Loverotties is offline
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Question

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Originally Posted by jayd1563 View Post
hhmmm how to get better gas mileage for a trailvoy??? yeah ive got one, buy a Chevy Aveo.
Push or pull with it?
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  #8  
Old 01-06-2012, 08:09 AM
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Trailblaze_2002 Trailblaze_2002 is offline
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Originally Posted by Loverotties View Post
Push or pull with it?


I would say the best way to see any improvements in mileage would be like stated before "get a CAI" and to go with it get a tune. Loose the can on the back that takes off some weight about 10-20 lbs worth. Get a better flowing exhaust (make sure to get tuned for this if you do). New plugs and basic tune up stuff wouldn't hurt either. Fuel filter, seafoam treatment and that is about all you can do.

I don't think you'll see much better than 23 maybe 24mpgs with a tune and a granny foot...

Goodluck,
Drew
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  #9  
Old 01-10-2012, 10:07 PM
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peepod2727 peepod2727 is offline
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I have been thinking of things to help my mpgs as well. Today I filled up and did the miles driven and gallons used method and I got 10.7mpg. I think this is because 1.cold weather 2. how I've been driving (like 85-90mph on the highway at times, i know stupid) 3. I think i need to clean my TB and change the plugs. My air filter is clean, so thats fine. Oh and my Voy has 208,000mi (got it a year ago) so I'm sure a lot of things has been changed in a while.
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  #10  
Old 01-12-2012, 05:13 AM
Craabe Craabe is offline
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You could try these Plug wires. Its says that it is guarunteed to increase MPG by 15%. Havent tried them yet i am getting mine next week.
http://www.jcwhitney.com/mpg/plus-ga...=d16942y2007j1
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