The power tune is geared toward those looking for more horsepower. While the Power tune does not typically improve fuel economy it will increase HP and Torque by 15-30% adding extra horsepower and torque for pulling large grades. The power tune adds about a 15% increase in both horsepower and torque to the rear wheels. (all increases above the standard pre-loaded 15% Power tune will require a custom tune adjustment and may require a higher torque rated Clutch and Transmission)