gmc yukon 2004 5.3

[smith]

I have 5.3 2004 Yukon how can I increase my mpg ram air or cold air diffrent maybe I should chip my Yukon or high performance something would better air flow help just thought I would ask the gas gods

[theholycow]

Take a look at this thread, same exact vehicle:
http://www.gassavers.org/showthread.php?t=13712

For your specific questions, here's what I posted in that thread:
Expensive intake, exhaust, computer, and bolt-on upgrades do not work (unless you are driving like a jerk all the time). Some people (never the ones with good hard data) claim an improvement on these trucks, but the improvement is never enough to pay for itself.

[smith]

Could I chip my gmc yukon to get better mpg I was looking at super chips

[theholycow]

I don't think an economy tune will pay for itself in a reasonable amount of miles. A more common power tune will reduce your fuel economy.

[smith]

What can I do than anything to help my Yukon gain even 5 mpg better

[theholycow]

See this thread, it's exactly the same discussion about the same vehicle:
http://www.gassavers.org/showthread.php?t=13712

In short: Inflate your tires to maximum, go medium-speed through green lights instead of stopping at red lights, brake less, coast more. Also, if you're willing to go slower on the highway, every mph you slow down will help.

Which rear end gear ratio do you have? Look at the label in your glovebox for RPO codes beginning with G. GT4: 3.73. GT5: 4.10. GU6: 3.42.

[smith]

Ok thank you for your help

[Jay2TheRescue]

A 5 MPG gain on a Yukon would equate to about a 40% increase in economy. No bolt-on device will get you that. As Holy Cow said, keep tires to the sidewall max pressure, drive the speed limit, combine trips, and avoid stop & go traffic.