ISX poor fuel economy

[farmtrucker]

2010 Pete 386 380,000 2007 ISX. Purchased used at 330,000. Average around 5 mpg and seems to lack power. I got high exhaust gas temperature warning. Two shops looked at it one wanted to put new turbo on it other shop had no idea. Did egr tune-up, doser, and had dpf cleaned. It was a real mess and the egr valve was stuck. Replaced egr valve and cleaned and replaced sensors as described in video. Installed a boost gauge and while under load can get 35 to 40 lbs of boost. I drive 70 mile round trip to ethanol plant running 60 mph. Seems like every trip for 5 to 10 minutes it blows white smoke with odor. I guess it is regen. I am wondering what I need to do next to make this truck run better. I do not have insight software and not sure how to get it without spending a fortune. Any help would be great.