ISX fuel mileage help

[Chamberpains]

Also your exhaust back pressure sensor and piping and housing I need to be free and clear of soot. Replace the sensor and clean all the soot and garbage from the openings. There is a little stainless steel tube that runs from the exhaust manifold to the back pressure sensor housing. Make sure that is free and clear. Run a pipe cleaner through it.

What are your boost levels getting to? Do you own Cummins insite? If not that should be way up on your list of things to purchase. You're doing a lot of elevation changes in your route out there in the west. This could also be a barometric pressure sensor issue. You need Cummins insite to be able to monitor what your sensors are putting out and reading.