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This is a discussion on WRX Gas Octane Preference... within the Everyday Impreza Talk forums, part of the Community - Meet other Enthusiasts category; Yeah, that's 96%+ of the stations here in CA too. I don't know about you man, but I'll drive around ...

  1. #31
    Registered User UEDan's Avatar
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    Re: WRX Gas Octane Preference...

    Yeah, that's 96%+ of the stations here in CA too.
    I don't know about you man, but I'll drive around all the pumps looking for the last pump that used premium. It said that those hoses carry up to a quart of the last grade used.
    And most people here use regular.... eff that man.

    Posted from a fone.

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  3. #32
    Admiral Ackbar the 1st mycologist's Avatar
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    10 gal = 40 qt

    1qt / 40 qt = 2.5%

    87*.025 + 93*.975 = 92.85

    I'm not going to sweat a 0.15 octane hit.
    "From a little spark may burst a mighty flame." - Dante
    "The stitch is lost unless the thread is knotted." - Italian proverb

  4. #33
    Registered User UEDan's Avatar
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    Actually when I have a full take, its hammer time. To keep myself in check I get 5 gallons at a time so:
    1qt / 40 = 5%
    87*.05 + 91*.95 = 90.8
    We only have 91, MAX.

    But overall, I guess you're right. Not gonna waste my time looking like an idiot going to every pump.
    I've started to self tune. I'm making my stage 1 even more conservative =/

  5. #34
    Administrator RayfieldsWRX's Avatar
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    WRX Gas Octane Preference...

    Quote Originally Posted by UEDan View Post
    And most people here use regular.... eff that man.
    .
    In WRXs, or generally? If regular is what the car is engineered for, then that's the best choice.
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  6. #35
    Administrator RayfieldsWRX's Avatar
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    WRX Gas Octane Preference...

    Quote Originally Posted by mycologist View Post
    10 gal = 40 qt
    1qt / 40 qt = 2.5%
    87*.025 + 93*.975 = 92.85
    I'm not going to sweat a 0.15 octane hit.
    This. Some things aren't worth the sweat.
    --Ray
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  7. #36
    Registered User Zitro's Avatar
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    Well like a dummy I accidentally started filling my tank with regular and got 7 gallons before I realized it, had a holy crap moment, and filled the rest up with 91 premium. Hopefully this doesn't cause any damage Derp
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  8. #37
    Registered User Scoob1318's Avatar
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    Maybe you should add some octane booster haha

  9. #38
    Registered User Zitro's Avatar
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    Most threads I've found on here say octane booster is useless. They also say to stay out of boost, but I floored it for probably 2-3 seconds on the highway, so now I'm freaking out that I damaged my new baby. Hoping I'm being paranoid. I didn't hear any ping/knock.
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  10. #39
    He simply abides. SD_GR's Avatar
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    Octane booster is worthless.

    You will be fine. Read the manual; it's explained there.
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  11. #40
    Registered User Zitro's Avatar
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    I did read the manual and I know bit says 87 is temporarily o.k.. I was more concerned about the quick flooring on the highway as people here are saying it's ok only if you stay out of boost.
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  12. #41
    He simply abides. SD_GR's Avatar
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    The ECU can retard timing -- though up to a point. I'd be interested to see a low octane full throttle log though, you're right. I'd just drive normally and not worry meanwhile.
    WRX Info Links, Courtesy TheJ
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    Hi, new member here, was wondering if higher Octane has caused any problems with overheating, I have the oppotunity to purchase 104 unleaded, however, I want to make sure I'm not going to cause any issues with my 2012 STI. I have never tried to fill it up with anything higher than 93.

  14. #43
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    Quote Originally Posted by sonicdrumm80 View Post
    Hi, new member here, was wondering if higher Octane has caused any problems with overheating, I have the oppotunity to purchase 104 unleaded, however, I want to make sure I'm not going to cause any issues with my 2012 STI. I have never tried to fill it up with anything higher than 93.
    No, 104 won't cause the car to overheat. It will also do absolutely nothing for you unless you are tuned for it. Don't waste your money.

    The only connection I could think of between fuel and heat would have a lot more to do with tuning. If you were tuned for 104 you would likely be running a lot more boost and seeing higher EGT temps. 104 by it self won't do anything bad to your car, just your wallet.

  15. #44
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    I put 85oct in my car.


    So cheep. Much savings. All MPGs. No performance. Many knock. Amaze cost.
    Last edited by xFalleNx; 11-13-2013 at 08:48 AM. Reason: added more doge references....
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  16. #45
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