Canned tunes question from an Expy newbie.

[bivenspack]

I just purchased an 05 Expedition EB w/5.4 liter 3valve engine. I haven't done any mods yet (bought it at Christmas) but I going to do the Gott's mod first. Second I'm considering buying a tuner. My question is what's in the canned tunes? This is our family vehicle for the most part with my wife driving the majority of the time. While we don't tow a lot I will use it occasionally to tow my car. We mostly use it for family trips (camping/hiking, etc). What I'm really looking for is fuel mileage improvements but still maintain the towability power and torque I purchased the vehicle for. I searched the forums to find the answer, but maybe I didn't go back far enough. Any help would be greatly appreciated before I make a tuner purchase.