The programer i went with is the H&S Mini Maxx.
With the stock exhaust and DPF still in place and the stock air box, I am running it most of the time in the "Mild" setting and seeing 2 to 2-1/2 mpg better.
I'm not sure what either of those are, I am just using what was in it when I bought the programmer.
I think now you have taught me that there is more I need to learn about this thing!
"Canned" tunes are the tunes that come preloaded on the tuner from the manufacturer. "Custom" tunes you would get from a company like KEM or Innovative Diesel.