Using the 1715 is a breeze. Plug the cable into the diagnostic port under the dash (easy to find and reach) and the tuner. Pull the fuel pump fuse (instructions say this fuse MUST be out) and turn ignition to 'on' but DO NOT START. Follow instructions on screen. Biggest problem I had was being scared I was going to do something wrong. In less than 15 min the first time, I had it done. I believe it makes a lot of difference in power and if I drive it with a light foot, it does better on mileage than without the program. Pulled my 9000# trailer on vacation to WY and CO this summer, and it made a lot of difference. I use midgrade when not pulling, and premium when using the trailer.

Got a 6.0 on order, don't need the tuner anymore. Any interest?