Hey OP, i believe you can get away with the SCCM and buttons. Last I checked forscan can only increase the mileage not decrease. You should be able to take it to a dealer and have them reprogram it for you or maybe someone here or on hte 6g forums can help with that. I know Breeves on the 6g forums does it for the digital dash so I think he can also reprogram it for you but i am not sure what he charges