Inexpensive, adds a little power, and gets good bang for the buck.... Hypertech E-Con Fuel Economy tuner. It has the first two tunes in it from the MAX ENERGY tuner. In the Econ they are called A and B.
Hypertech 53007 Dodge Ram, 2500/3500 2007 5.9L (td) Hypertech's new Max Energy E-CON economy Power Programmer extracts every bit of energy possible out of every molecule of fuel to give drivers exactly what they want - more miles-per-gallon at part throttle and more power at wide open throttle.