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I apologize as I am sure this has been discussed, but I have searched and can't find it. I'm currently running 35x12.50s with stock suspension and I'm averaging 18.5 mpg hand calculated, which is mostly highway. I have 3.55 gears. How much should I expect my mpg to decrease going to a 4"...

I have experienced an odd rough idle four or five times in the last couple months. It sounds kind of like a lope tune and the truck shakes a bit. As soon as I put it in drive or touch the gas pedal it stops. I have noticed on my CTS2 that the injector timing jumps back and forth from around...