I want to get a tuner and DPF delete for my '08. Do I really need to spend the money on a Spartan tuner? I don't care about getting an extra 250hp. I strictly want to get better fuel mileage and make my truck run properly. I currently average 360 km/tank in town and roughly 520 km/tank on the highway. I use my truck mostly for work and hauling large trailers. The truck now has 92 000km on it and it's about time I fix my fuel mileage issue. Any suggestions are much appreciated.