What did you do to your NBS GMT800 Tahoe/Yukon Today?

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06JET

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Reprogrammed my Yukon XL with my old Superchips programmer. I have had it for 12 yrs just sitting around and to be honest, I forgot about it. Used to use it on a 97 truck I had. I was needing to correct my speedometer and it hit me that I had it and it would do it, so I went ahead and used the 87 octane program. At 75 it is reading 72-73 so I'm calling that good. I need that little buffer zone.
 

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