i am looking for a programmer for my 2006 Silverado 5.3 auto. I want the best mileage when I am not towing a camping trailer and the best performance when towing the trailer both in the mountains of NC where we live and when we travel to the flat lands. My thinking is that one that has a dash mount interface like the Edge is what I need becasue I can make adjustments as I drive or tow and the terrane changes or if I get ainto a place where the gas is not up to par. But I am posing this as a questilon becasue after reading some of your posts it is obvious that some of you guys really have a vast amount of experience and knowledge with this subject and your input would really be helpful. Thanks, Q.