First off, I have a 2012 RAM 3500 with 295,000 miles on it.

I'm looking to delete and tune it, mostly for fuel mileage, but also added horsepower and healthier for the engine.

I was a diesel tech for Caterpillar for 10 years, so I understand the mechanics of my truck, but I'm new to the performance and tuning aspect.

I've been looking heavily at the RaceME Ultra recently.

What is everyone's opinion on the best tuner, from where, and why?