I have nearly the same truck except I have a 5" exhaust and 4.11. I also have 60hp injectors I'm getting about 18 hand calculated running 60-65 I think my boost is lower than than on flat highway.

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Do you have the truck Tuned Or is that just the Stock Tuned

 

No that was stock, it was also very best scenario, straight highway driving normal driving in and out of time I get about 15.5

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