I use this model, I would say all the aftermarket programmers will see similar results in HP and MPG. Pre tune with 37's I was getting an 8 mpg average while city driving, post tune it's about an 11. HP wise the truck really smoothed out but the power isn't anything that would whip your neck back. The major benefit of these tuners is being able to read and clear error codes and setting tire sizes or shift points, the mpg and hp gains are a bonus
