Mines a f350 crew cab dually and I get 12-13 mpg now, with nothing on it... I will let y'all know what I put on it and what I gain.

 

I just did this nearly same setup this week. H&S mini maxx with a cat/dpf only pipe and S&B intake. Hot Damn 300 setting is absolutely unbelievable!!! I am very happy with it and yes it is a lot to spend on the tuner alone but I believe it is worth it for the fun factor alone. Not to mention that I went from avg of 13.5 mpg to 17-18ish on the lie-o-meter, having only ran a tank so far resetting after install. Just to not make oil anymore, have white-ish-blue smoke pouring from the tailpipe during regen's, and ability to monitor important temps and boost= no brainer for me...

EGR delete up next! AND THEN ladder/traction bars...AND THEN whatever breaks next...AND THEN...who knows but I got a feeling this is going to get fun/little pricey!

 

Just using the lie o meter I went from 12 to 14mpg with teh same set up.

I run mine in street mode because on performance, its easy to hit 1500deg. Too hot for my liking.