I have a 2007 Yukon 5.3L (127,000 miles) that is stock or was til today. One of my offices is 98.3 miles from my house, mostly 65mph driving with a few small town 35-45mph's along the way. I drive this regularly and have been getting roughly 18.3-18.4 mpg.
Today I went and had a Magnaflow 14" muffler (part# 11235) installed and had the resonator eliminated too.
Other than the initial smell everything is great. The sound is good but not overbearing. Today upon my return home I got 20.3mpg's. I know that my driving style is the same because I'm currently doing the Progressive Snapshot program and trying to keep it close to the posted speed limits.
Is this actually a true improvement in mpg's or is this a first day anomaly? I will continue to monitor this but I'm satisfied with this increase if it stays true.
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I also ordered the Volant CAI this afternoon and plan to get a Black Bear tune after that. Is there any other simple bolt on's that anyone would recommend before getting the tune? I want to make sure that I have all my mods completed before I get tuned. I know there are lots of threads recommending what to do but I figured I'd give you guys and gals something to talk about on a Thursday night.
Today I went and had a Magnaflow 14" muffler (part# 11235) installed and had the resonator eliminated too.
Other than the initial smell everything is great. The sound is good but not overbearing. Today upon my return home I got 20.3mpg's. I know that my driving style is the same because I'm currently doing the Progressive Snapshot program and trying to keep it close to the posted speed limits.
Is this actually a true improvement in mpg's or is this a first day anomaly? I will continue to monitor this but I'm satisfied with this increase if it stays true.
________________________________________________________
I also ordered the Volant CAI this afternoon and plan to get a Black Bear tune after that. Is there any other simple bolt on's that anyone would recommend before getting the tune? I want to make sure that I have all my mods completed before I get tuned. I know there are lots of threads recommending what to do but I figured I'd give you guys and gals something to talk about on a Thursday night.
