Did a little un-scientific experiment after my last fill up. My mileage dropped from 15.7 to 13 flat once I turned the PWR button on. On a bone stock rig, this isn't the way to go if you're looking to improve mileage.
Extra Power Button - Full Time
- Thread starter Yukon LX
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Don't know that the pwr button would come into play when cruising at speed. It really just adjusts the shift points. I use the pwr buttom around town, but adjust the shift points with the way I drive so it doesn't have much affect on mileage for me (sucks with and without it on)... it is nice to get the higher revs when you want them at slower speeds though without having to mash the skinny pedal to get a downshift.