MUDDINSQUID
Registered User
What is the best one for the 2008 6.7L I am looking for performance for towing, but mainly better milage. Also I need something that wont be detectable by the dealership. So I need to be able to unload the program, when service is needed, then plug it back in and upload afterwords. any help would be nice. I just bought this a few weeks ago and love the truck butafter the new computer update the milage sucks. Prior to the new compter mapping I was getting close to 22.5 mpg consistant, now I am lucky to get 17.5 consistant. thanks Rick