Counterintuitively, a quality 120 flash can improve highway mileage by 2-4 MPG. The advanced timing burns fuel more completely during light throttle cruising. However, heavy use of the extra power will decrease economy.
Connect your interface (e.g., Scanmatik clone) to the vehicle's OBD2 port. In PCMflash, select "Read." The software will save a binary file (usually .bin ). This is your —keep it safe.
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