new 5.9 owner

[teebarjake]

I finally found a clean 2007 5. 9. It has the BD auto Transmition, new 4 months ago, 5" exhaust, cold air box, bully dog and some intake mod's. I sold my 6. 7 because of such poor fuel millage and to pull 15,000 LB trailer what setting should I use on the bully Dog, for the best fuel millage, I Drive modestly and only what it takes for best millage??? Help