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Cadillac Seville / Cadillac Eldorado Forum Discussion, mileage in Past Cadillac Vehicle Discussion; My mileage has gone from a great 28-31 highway to 21-23 overnight. I drive a 98 northstar. Any thoughts? Thks....
  1. #1
    98Eldy is offline Cadillac Owners Member
    Automobile(s): Eldorado
    Join Date
    Aug 2003
    So. Calif. Desert


    My mileage has gone from a great 28-31 highway to 21-23 overnight.
    I drive a 98 northstar. Any thoughts? Thks.

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  3. #2
    Loud 93 STS is offline Cadillac Owners Member
    Join Date
    Aug 2003
    Murfreesboro, TN

    Gas Mileage

    Have you switched brands of gas? That can definately sometimes afect mileage. Or have you put in an new air filter? That is another thing that can help out mileage. Other than that I really have no clue.

  4. #3
    Katshot's Avatar
    Katshot is offline Cadillac Owners Master
    Join Date
    Jan 2003
    Newtown, PA

    Re: Gas Mileage

    Unless you changed something like fuel, oil, some sort of parts on the car, etc. it could be a plug went south on you, or maybe an ignition wire, coil, or even an O2 sensor.

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