I Have recently purchased an 04.5 LB7 C/C Short Bed Diesel, Chevy. I purchased for it a Triple Dog Programmer, from Bully Dogg. Well, I ran the programmer W/O making any mods to the intake as well as the exhaust. It runs fine, so I think. My question to all that have lots of experience with these trucks. Since adding the programmer, my DIC has shown me a very large increase in MPG, is the DIC correct. Because if it is, I can't believe it. I will not reveal what it says until I get some responses. It is very hard for me to think that a truck so large so could possibly get that kind of fuel economy. I will add to that; I have purchased a Bully Dog 4" exhaust and a K&N intake. What if anything do you all think of that combination.