Best clean OS for 07 5.9

[superwagon]

Is there a preferred OS to use on a 07 cummins 5.9 if somebody was looking fora clean file to start from if truck had a smarty previously? I think mine was stock wheni bought it but it seems to be getting poor mpg and I am contemplating trying a clean file from tune file Depot and wondering which one might be preferable over another?
Thanks

 

[Kdubya]

Do you remember what kind of mileage you were getting before you put the bigger tires on it? 11450202 is a good OS for your year model truck.

 

[superwagon]

It had 305/70/17 worn out when we got it. We put the 285/70/17 coopers on a couple weeks after we bought it. Mpg have stayed the same since we got it too. 12-14 hand calculated before and after the new stock injectors and ad150.