Ok, I've got an 07 GMC HD/2500 with the 6.0 and all is stock. What do I have to do to increase gas milage. Intake , exhaust , chip , who has done what and what have been the results. I have ideas but I want to hear what has worked. Currently I am at about 14 mpg. Thanks

 

better then i'm getting in my 03 13.1

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do a search on gas milage you will find a crap load of answers. i would sujest going to the silverado forum on here. There is a lot more action.