All I can say is HOLY CRAP! Coming from a 2000 6.0 vortex this set up is awsome! The truck doesn't even flinch! 70 and sunny about 70 miles from home and 12.2 MPG--NICE! I am grinning!
all time towing low in my LBZ was a 9.8 all time high was 13.6
average is 11.8
all hand calculated (which in my case usually also matches my DIC....The DIC fluctuates every once in a while, but it's usually pretty much on for me).
Congrats on your new ride....you're going to wonder how why you ever towed with a gasser.