06 W900L C15 Acert MPG Help

I know this issue has been beat to death but I am no good at searching the forms for info and what I can find is that you need to get ahold of Mr.Haney to reflash your ecm, only problem is i cant find info on how to get ahold of him. Just like many others I have a MXS ACERT C15 and it gets Horrible MPG Compared to my old T800 with an N14. Like 4.3 to 4.7 MPG. I live in South MN so mostly flat land running 90K pulling a Tri Ax Hopper no more than 60MPH and I'm getting my butt kicked on the fuel bill. Any tips and tricks would be awesome other than buy plastic turban burban.
Truck specs as follows.
2006 W900L C-15 ACERT MXS 550/1850 Tune IVAs are backed off with straight pipes
3.55 Rears
265WB
10sp
22.5 high pro duals
72in sleeper
My T-800 was about the same just with a 525 N14, Low pro supers, and a 13sp and a little shorter frame. I was talked into a cat because they are supposed to be the bees knees when it comes to motors and was supposed to be sooooo much better than my N14 and so far it don't seem to pull much better and is a MPG is a lot worse pulling the same trailer loaded to 90K.

 

As far as RPM I'm looking at about 1350 or so running 60mph in 10th. I don't know that any sensors are bad. About a month ago I had all 6 injectors replaced and the 550 tune put on, was previously a 475 truck and had 2 completes dead holes. At the time when the truck was in he didn't mention any sensors being bad or out of spec and when I called him and told him I'm getting dog #### for mpg his answer was it's a Cat pretty much. Well, my dispatch runs a 700hp 2ws and gets better and my buddy that runs the same loads I do said he gets 5.5-6 with a 5EK. I'm not sure what ya mean driving it like a Cat or a Cummins u less your referring to shift points, if that is the case I'm running it up to 17-1800 to shift, i want to shift at 15-16 but the Ole 10sp won't allow for that. If I pull out at 18 I'm at 12 going back in, around 1000-1100 she's and unhappy girl.