Originally Posted by Vis-a'-vis

What Squid said
Search this site and you'll see how to drive this beast...
Minimize Idle time
Drive with the EB on
Choose grears that keep the rpms higher
Don't lug the engine
Do some WOT from time to time to flex the vanes in the turbo
Most likely, you still have plenty of boost...it's just the senor with soot on it.
Don't use additives and try to get fuel around 47 cetane