I've had my truck for 4 years now. First I tried one of those "JET" chips and I wasn't satisfied, didn't do much for performance and I actually lost MPG. I've had a Superchips tuner before when I had a Dodge Charger and I knew I had to go back. What a difference. I tuned for 93 octane, raised the rev limiter to 6200 and turned up the shift points. Now my RAM runs like it's supercharged...really! Can't believe the difference and no lost MPG. Well worth the money.
Had this for about a month in my 04 Ram 2500 5.7 and could tell immediately a little extra punch on the throttle. I think I like the modified shift points the most. However, running in 87 octane mode the whole time and lost about .5mpg - I was sort of expecting a little improvement here. It does seem to idle a little smoother too.