mpg improvements?

anyone know any good mods for improving mpg?  will headers help?  my 4.3 4x4 is pretty much stock other the some visual upgrades.

Get the PCM tuned for higher octane fuel and matched to whatever other mods you want to do would be the cheapest/most bang for the $

Headers could help, but usually you won't see an increase from headers without doing the rest of the exhaust (high flow cat, preformance muffler..).  And then you won't see a real boost from exhaust alone, you need Intake as well as better exhaust flow...so that puts you to a CAI...

And then there is the argument that even with a better intake and exhaust, you won't see much gain without modding to let the engine handle the better breathing...so you'll need the tune or better plugs/wires maybe..

Haha what a slippery slope. 

Don't take this the wrong way (most everyone does though), but have you searched?  These type of topics have been discussed in quite a few areas.  Try a few different criteria, pretty much anything you can think of.

quote:

ORIGINAL: WolfPack

Get the PCM tuned for higher octane fuel and matched to whatever other mods you want to do would be the cheapest/most bang for the $

Headers could help, but usually you won't see an increase from headers without doing the rest of the exhaust (high flow cat, preformance muffler..).  And then you won't see a real boost from exhaust alone, you need Intake as well as better exhaust flow...so that puts you to a CAI...

And then there is the argument that even with a better intake and exhaust, you won't see much gain without modding to let the engine handle the better breathing...so you'll need the tune or better plugs/wires maybe..

Haha what a slippery slope. 

 
I got an improvement from just putting the new muffler on

I changed my Oil and Added in synthetic oil and used some fuel injecter cleaner and it bumped me from 15 MPG to 19-20 MPG