Gas Question
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This is a discussion on Gas Question within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Just bought a new WRX and I love it. The only drawback is the premium gas, which obviously is needed ...

  1. #1
    Registered User fatcowboy10's Avatar
    Join Date
    Jun 2008

    Gas Question

    Just bought a new WRX and I love it. The only drawback is the premium gas, which obviously is needed because of the turbo...

    Has anyone tried a 89 octane gas and more specifically that which has 10% ethanol added (big in South Dakota because of the corn)? Im just wondering what the long term affects of putting that in would be...

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  3. #2


    Speedette's Avatar
    Join Date
    Aug 2005
    Sterling, Virginia
    Give your car what it needs, 91 or better.

    Read this:
    Heather | 2002 WRX | Stage 2
    ScoobyDMCtt | Official Bodyguard #2 for the Bugeye Mafia
    TastesLikeAwesome | @Subiestar

  4. #3
    Sammich Makin' Pwincess wrxtreme06's Avatar
    Join Date
    May 2007
    orlando flawduh
    I Support ClubWRX
    over here in FL we have 93 octane with that 10% stuff in it and my car has been fine. its such a small amount that you wont see any side effects of it. (atleast most people have no had any problems)

    your friendly, neighborhood subaru girl

    abbigale : 06 impreza wrx tr: cobb stage II

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  6. #4
    Registered User jeffmm06's Avatar
    Join Date
    Sep 2007
    Sacramento, CA
    its only a $2-3 difference anyways. Give it what it needs or sell it. 89 will casue it to perform rough and potential hurt the car.
    2005 WRB WRX "was" STAGE 2

  7. #5
    Registered User
    Join Date
    Jan 2005
    Canada B.C.
    I put in 94... ALWAYS. Whenever I'm in a place that doesn't have it and I HAVE to put in 91, my mileage drops like a rock. I think it's actually cheaper to use the good stuff as it's better for the engine AND pocketbook in the end even tho it may seem cheaper while looking at the pump and choosing what looks like it would be cheaper... BLAH... blah ...blah,
    '02 WRX 4EAT, 311,000KMs/194,500Miles, Sold. Best car I ever had. '09 STi stage 1, hope this one will be good too...

  8. #6
    Registered User jcaputo's Avatar
    Join Date
    Dec 2007
    Shrewsbury MA
    Quote Originally Posted by Speedette View Post
    Give your car what it needs, 91 or better.

    Read this:
    My thread!

    Premium is cheaper in a WRX. Use it.
    '05 silver WRX
    Blobeye Syndicate #28
    Raammat Soundproof Thread
    The Octane Thread

  9. #7
    Registered User teflon_jones's Avatar
    Join Date
    Apr 2007
    8000' up in Colorado
    I only use diesel in my STi. Makes it fly!
    Past Subies - '11 STI Limited stage 1+ and '04 STi stage 2+
    '13 Wrangler Rubicon - custom front bumper w/12k lb winch & off-road lights, skid plates, diff guards, etc.
    '04 Porsche 911 Turbo GT2 clone 600 HP/TQ
    '77 F-150 heavily modded for off-roading

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