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fuel economy

  1. cruise/engine computer problem

    General Discussion on Issues / Trouble Shooting
    I have a 2006 300C AWD that I have put 180,000 on. Just as I passed 180000 the cruise stopped working and the fuel economy dropped from 22 to 18. The cruise worked again for a few minutes the next day but has been gone since. I suppose this is an engine control unit gone bad but before I walk...