Got a free Superchips programmer for the GMC. Computer is saying I am getting about 4 more mpg than stock. Gottta take a lil road trip and see. Averaged about 13 last trip lifted on 33's. Now I'm showing 16 and 17 on the instant mpg. I hope it's true. Also like the extra torque. Feel a real gain when getting on the freeway. Time will tell.
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