Superchips Mileage XS Programmer will improve your vehicles fuel economy through optimized engine management. Each calibration is validated for accurate results allowing you to buy and drive with confidence. Some of the key features of the Superchips Mileage XS Programmer are Optimizes engine management for increased fuel economy and Validated calibrations and economy gains.Superchips Mileage XS Programmer will also Retrieve and clear check engine codes,Recalibrate odometer, speedometer & shift points for wheels, tires & gear upgrades. Superchips Mileage XS Programmer makes available, where applicable, calibrations to run lower octane gas on vehicles that require 89 octane saving you money at the pump. There is free online updates at www.superchips.com and (coming soon) Upgrade to fully featured Flashpaq performance programmer for additional charge ( Additional Features vary by application)