anchor.diff:  "BUICK","LACROSSE/ALLURE",3.8,"Auto(L4)","MIDSIZE CARS",6,"F",25,17,28,21,21.8,38.6,27.11,"regular gas","06/10/07",,"http://www.fueleconomy.gov",
   "BUICK","LUCERNE",3.8,"Auto(L4)","LARGE CARS",6,"F",25,16,25,19,21.8,38.6,27.11,"regular gas","06/10/07",,"http://www.fueleconomy.gov",
   "CHRYSLER","PACIFICA FWD",3.8,"Auto(L4)","S.U.V. - 2WD",6,"F",818,15,22,18,19,30.3,22.832,"regular gas","06/03/07",,"http://www.fueleconomy.gov",
  -"CHRYSLER","TOWN _AMPERSAND_ COUNTRY 2WD",3.8,"Auto(L6)","MINIVAN - 2WD",6,"F",822,16,23,18,19.7,31.9,23.795,"regular gas","06/01/07",,"http://www.fueleconomy.gov",
  +"CHRYSLER","TOWN & COUNTRY 2WD",3.8,"Auto(L6)","MINIVAN - 2WD",6,"F",822,16,23,18,19.7,31.9,23.795,"regular gas","06/01/07",,"http://www.fueleconomy.gov",
   "DODGE","CARAVAN 2WD",3.8,"Auto(L6)","MINIVAN - 2WD",6,"F",822,16,23,18,19.7,31.9,23.795,"regular gas","06/01/07",,"http://www.fueleconomy.gov",
   "HYUNDAI","AZERA",3.8,"Auto(L5)","LARGE CARS",6,"F",10,17,26,20,21.4,35.6,26.082,"regular gas","07/18/07",,"http://www.fueleconomy.gov",
   "HYUNDAI","ENTOURAGE",3.8,"Auto(L5)","MINIVAN - 2WD",6,"F",5,16,23,18,19.8,31.5,23.774,"regular gas","07/18/07",,"http://www.fueleconomy.gov",
  
positive.code: "VOLVO","XC 70 AWD",3.2,"Auto(S6)","S.U.V. - 4WD",6,4,15,15,22,17,18.2,30,22.114,"premium gas","07/02/07",,"http://www.fueleconomy.gov",
  "VOLVO","XC 90 AWD",3.2,"Auto(S6)","S.U.V. - 4WD",6,4,15,14,20,16,17.299,27.299,20.714,"premium gas","07/02/07",,"http://www.fueleconomy.gov",
  "VOLVO","XC 90 FWD",3.2,"Auto(S6)","S.U.V. - 2WD",6,"F",15,14,20,16,17.539,27.539,20.964,"premium gas","07/02/07",,"http://www.fueleconomy.gov",
  "CHRYSLER","TOWN _AMPERSAND_ COUNTRY 2WD",3.3,"Auto(L4)","MINIVAN - 2WD",6,"F",825,17,24,19,20.8,33.099,24.976,"regular gas","06/29/07",,"http://www.fueleconomy.gov",
  "CHRYSLER","TOWN _AMPERSAND_ COUNTRY 2WD",3.3,"Auto(L4)","MINIVAN - 2WD",6,"F",824,11,17,13,14.2,22.9,17.128,"ethanol","06/29/07",,"http://www.fueleconomy.gov",
  "CHRYSLER","TOWN _AMPERSAND_ COUNTRY 2WD",3.3,"Auto(L4)","MINIVAN - 2WD",6,"F",823,17,24,19,20.8,33.099,24.976,"regular gas","06/29/07",,"http://www.fueleconomy.gov",
  "DODGE","CARAVAN 2WD",3.3,"Auto(L4)","MINIVAN - 2WD",6,"F",825,17,24,19,20.8,33.099,24.976,"regular gas","06/29/07",,"http://www.fueleconomy.gov",
  "DODGE","CARAVAN 2WD",3.3,"Auto(L4)","MINIVAN - 2WD",6,"F",824,11,17,13,14.2,22.9,17.128,"ethanol","06/29/07",,"http://www.fueleconomy.gov",
  "DODGE","CARAVAN 2WD",3.3,"Auto(L4)","MINIVAN - 2WD",6,"F",823,17,24,19,20.8,33.099,24.976,"regular gas","06/29/07",,"http://www.fueleconomy.gov",
  
negative.code: "PONTIAC","G6",3.9,"Auto(S4)","COMPACT CARS",6,"F",39,15,22,18,19,31.1,23.033,"regular gas","06/15/07",,"http://www.fueleconomy.gov",
  "CHRYSLER","PACIFICA AWD",4,"Auto(L6)","S.U.V. - 4WD",6,4,820,14,22,17,17.5,30.324,21.613,"regular gas","06/01/07",,"http://www.fueleconomy.gov",
  "CHRYSLER","PACIFICA FWD",4,"Auto(L6)","S.U.V. - 2WD",6,"F",819,15,23,17,18.1,31.5,22.385,"regular gas","06/01/07",,"http://www.fueleconomy.gov",
  "CHRYSLER","TOWN & COUNTRY 2WD",4,"Auto(L6)","MINIVAN - 2WD",6,"F",821,16,23,18,21.4,35.1,25.96,"regular gas","06/01/07",,"http://www.fueleconomy.gov",
  "DODGE","CARAVAN 2WD",4,"Auto(L6)","MINIVAN - 2WD",6,"F",821,16,23,18,21.4,35.1,25.96,"regular gas","06/01/07",,"http://www.fueleconomy.gov",
  "DODGE","NITRO 2WD",4,"Auto(L5)","S.U.V. - 2WD",6,"R",456,16,21,18,19.9,29.2,23.229,"regular gas","06/25/07",,"http://www.fueleconomy.gov",
  "DODGE","NITRO 4WD",4,"Auto(L5)","S.U.V. - 4WD",6,4,457,15,20,17,19.1,27.8,22.231,"regular gas","06/22/07",,"http://www.fueleconomy.gov",
  