I Installed an After Market Cat & I'm now getting 3mpg more than before

Discussion in 'Gen 2 Prius Main Forum' started by ski.dive, Jan 14, 2021 at 12:46 PM.

  1. ski.dive

    ski.dive Active Member

    Joined:
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    Location:
    Hutchinson Island,FL. Mt. Snow,VT
    Vehicle:
    2008 Prius
    Sold my OEM Toyota Cat. for good $$$

    I purchased and installed an After Market Cat.


    Don't know why...But now I'm getting 3mpg more than before
     
    PriusCamper likes this.
  2. sam spade 2

    sam spade 2 Senior Member

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    Vehicle:
    2017 Prius c
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    Four
    The CAT you took off was 12 years old and presumably had seen a LOT of miles.
    It might have been wearing out. They don't last forever and sometimes plug up when old.
     
  3. PriusCamper

    PriusCamper Senior Member

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    My theory is people who go to oil change places that refill Prius with too much oil not only causes bad MPG, but it clogs the Cat, especially if they go way too long between oil changes. Any chance you car could qualify for this possibility?
     
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