3 im looking into are the smarty, diablo sport predator and the bullydog. i hear the smarty is a very good chip but has horrible gas mileage. also hear the bullydog and diablo are good, but dont know much about them. anyone have any input that i can base my decission of off. it would be a daily driver so i want to have good power, nothing to blow the tranny, but also get good mileage. 2006 or 07 5.9

 

30 hits? i guess nobody knows anything about tuners on a cummins! c'mon guys!

 

the Smarty is the best programmer available for our trucks. If anything it helps increase mileage and in no way has been attributed to " horrible " mileage. IMO, I'd stay away from the other two.

You'll want to get the Smarty Jr based on your intentions. Mileage and a little performance is what it was made for.