Ok went on a trip this past weekend. On the way down to the Key West the MDS was still on. At the hotel took out the tuner put back the original tune and drove around for a day. It felt the same as far as the MDS situation but sluggish again. Next morning put the 91 Octane tune in with MDS turned ...

MDS is off....the fuel saver light is not MDS :)


In the owners manual this is what it reads...Vehicles with the 5.7 Multi-Displacement System may be equipped with the Fuel Saver Mode in the Trip Functions of the EVIC. The Fuel Saver Mode message will display above the average fuel economy in the ...

After loading the 91 octane tune with the MDS turned off and shift firmness higher the car still feels like the MDS is working. It also says fuel saver mode on the dash. Any ideas to correct this?

The tune has made a big increase in response. The main reason I bought the tuner was to turn off the ...