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low gas mileage

  1. 4th Generation Chrysler Minivans: 2001-2007
    I am having a very poor gas mileage. On highway it goes to over 19 MPG, and in the city it drops to 12 MPG. Air filter, tires pressure and spark plugs are ok. I need to check the fuel filter, but the reading is to low and I am wondering what else could be. O2 sensor? Catalytic Converter? I dont...