High gas mileage usage!!! Help!!!

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Cadillac Catera and Cimarron Forum Discussion, High gas mileage usage!!! Help!!! in Past Cadillac Vehicle Discussion; I own 2000 Sport, using highest octane gas and my gas mileage horrible only getting 210 miles per tank or ...
  1. #1
    JohnJJO's Avatar
    JohnJJO is offline Cadillac Owners Fanatic
    Automobile(s): 2000 Catera Sport
    Join Date
    Mar 2012
    Wilmington, NC

    High gas mileage usage!!! Help!!!

    I own 2000 Sport, using highest octane gas and my gas mileage horrible only getting 210 miles per tank or 14mpg !!!!
    what i can do or what need to be change to get better gas mileage
    I already done:
    ----year old oem spark plugs, injectors was handy cleaned (not cleaner in fuel tank)
    ----2,4,6 cylinder coil was replaced due to misfire
    ----fuel filter like 1,5 year old (it's should be less the 15k mile on it )
    ----both O2 sensors that before cat. were replaced due to check engine light
    ----seafome air system few times already since i got this car (curenly exhaust coming out fine)
    ----recently took car to mechanic (had some problem that were fix) he tasted fuel pump also and it was working fine
    ----using Castrol GTX 10w-30 oil since got this car
    ----just replaced air filter (my old one was not even dirty but i replaced any way) thought it will help - but it didn't

    No check engine light !!!! Car running great!!!
    Also im not crazy driver usually trying to keep rpm less than 3000

    What can be wrong or just not working right that can makes my car eat gas like that!!!!?!?!?!?!?!?!

    Any ideas????????? Please Help!!!!
    Thank you

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  3. #2
    gvjv3 is offline Awaiting Email Confirmation
    Automobile(s): 97 forest Green catera
    Join Date
    May 2012

    Re: High gas mileage usage!!! Help!!!

    do you allways get your gas at the same place?

  4. #3
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
    Automobile(s): 2001 Seville STS, 1990 Seville (RIP), 1972 Sedan Deville
    Join Date
    Sep 2010
    East Boston MA.
    Have you checked for a bad FPR?

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