Cummins X15 questions.

I had a daycab international with the X15 and put 124k on it before being sold, I got between 7-9mpg but 80% of my runs were interstate / highway, the reefer box was always 38k. capped at 70mph but I generally ran between 64-68 since I never had time constraints.

my only issues were the DEF system, the sensor constantly wore out fast and would dump more def than needed into the system.

other than that, zero issues.

Id imagine a sleeper and that Ken/petes are often heavier, youll get the 4-6 range.

efficient or aero packages only help if the driver is efficient, it doesnt make up for a heavy footed driver.

 

If you do want to have it deleted head over to the rawze dot com forum to find someone on there that actually knows what they are doing.. lots of bad deletes out in the wild that will end up taking out the motor in due time