I have a Spartan tuner and SCT. Spartan gets better mpgs for me 14 city. SCT gets 11-12 city. Spartan has more to choose from in the way of tuning, more power too. Nice tuner, more money and harder to get set up. Once you figure out how to do everything it is real nice. I am running 210 tune with those mpgs #s. 250 tune gets better mpgs but I don't like the hard shifting and I like having more safety measures that are in the 210 tune. Power wise the 250 is balls to the walls power! You won't believe how fast these trucks can run til you use the 250. Becareful if you use it, very touchy on the pedal. Scaared the shi_t out of me.