I am new to this site and a diesel for that matter. I am looking for insight into the best direction to go in for fuel mileage. Truck is stock and has no mods other than the high idle mod. I am afraid to put a programmer on it for fear of major engine trouble. I tow occasionally but nothing huge. Mostly around town with some highway and I am seeing about 16-18 mpg. Will the zoodad mod help and how much and what other recommendations do you all have. Thanks for all the help.