Suggestions please

[Mikefish34]

Good morning, I have a 2013 cummins 485 isx just had complete in-frame. I get bad fuel consumption (4.6) I hooked my computer with insite in diagnostics mode and drive down the road . I keep getting debate due to high altitude conditions and low boost which I think is because of high altitude conditions. My map sensor is reading 30.46 inches of mercury. The truck has mandate removed. Non vgt turbo (s400) any suggestions?