dodgintrouble

I'm looking for the best combo of fuel mileage and decent power for a stock tranny in my 2006 2500. I was originally thinking that just the diablo would be great and keep it on the performance economy setting. I later read in a magazine article on fuel mileage that the Bully dog triple dog has on average increased fuel mileage by 2 to 3 mpg. I do alot of running on the highway and with 4 10s in the truck it sucks down fuel going anywhere above 74 I will probably put on a little bit taller tire to help as well but I would also like the programer to play with. I have the guages for pyro trans and boost so a monitor is not needed nor do I want one (for dealer service reasons) So lets hear the stories and debates over this one. Thanks in advance guys.
- Eric