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Thread: What octane do you use?

  1. #1
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    What octane do you use?

    So, the VT is rated for regular (87), but what do you use? Also, do you see a difference in the performance and MPG when using different octanes?

    I usually use Mid and premium every other tank.

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    I use 93 pure gas all the time.

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    I use 87 octane since MPG sucks no matter what and gas prices are crazy.
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    93 w/ SFR Tune
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    I've used 89, but primarily 87. Do you guys notice a huge difference in performance/mileage at 93 octane? Is it worth it in the long run? I'd love to know the difference.
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    Quote Originally Posted by Dino64 View Post
    I've used 89, but primarily 87. Do you guys notice a huge difference in performance/mileage at 93 octane? Is it worth it in the long run? I'd love to know the difference.
    Well, I'm tuned for Premium now, so yea.

    The jury is still out my MPG's yet though since I'm still in the cycle that I my VT has to get through before it levels out.

    Before 93 I ran 87 w/ the occasional tank of 89. No noticeable difference here... Now it's a totally different story though.
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    Senior Member kimtyson's Avatar
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    Welcome to the forums VRT Grump.
    Please search before starting a thread. This subject is being discussed here, Regular (87 Octane) or Premium (92-93 Octane) Fuel --- Do you notice an improvement?. You will all see a lot of replies on that thread. There's even a poll.

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    FWIW I use roofing tar...
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    Even in the brochure they say regular 87 octane gas is ok...But they point out using Premium 93 for best performance...I'm getting this free tank of regular goona put premium after for sure...

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    If you removed the Cat, could you run Race gas in our cars?

    I think somebody who's not me should try it and let us know how it goes
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  12. #11
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    If you remove the 'cat' you could run leaded fuels.

    It's a myth regarding improved performance from higher octane fuel being used in a motor designed for lower octane fuels.

    Only by admission to the control pathways in the ECU can you adjust the ignition timing re:advance curve to take advantage of higher octane rated gasoline.

    Your not going to do it by disconnecting the power supply for any length of time.

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    My VT drinks 2 1/2 tanks of WAWA 87 a week.
    I drive 600+ miles a week so I made sure to buy a car that runs on the cheap stuff.



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    Whatever is ethanol free around and that just happens to be Shell 91.
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  15. #14
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    Shax07-

    Be careful of racing has despite any upgrades you decide to do...it has a very high octane rating meaning it Burns at a much higher temperature, thus providing higher performance in racing cars however if your engine is not built to withstand the added heat of a higher octane burn… You could destroy the engine


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    Senior Member Ricky-D's Avatar
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    Quote Originally Posted by banditandonian View Post
    Shax07-

    Be careful of racing has despite any upgrades you decide to do...it has a very high octane rating meaning it Burns at a much higher temperature, thus providing higher performance in racing cars however if your engine is not built to withstand the added heat of a higher octane burn… You could destroy the engine
    Actually, it's the other way around.

    Lower octane burns hotter.
    Lower octane burns faster.

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    Hi guys, easy answer to this.

    In a turbo car, especially these days with all the electronics, the lower octane fuel you put in, the less performance, and EVEN possibly economy can suffer.

    Hyundai was very conservative picking a 9.5:1 Compression ratio for the engine. Honestly they could have probaly got away with 10.5:1 or higher... But they wanted that 87 octane use.

    If you put low octane in (87) your engine will retard ignition timing, and lower boost to a non-knocking level.

    Premium will let your CPU, advance timing, and increase boost pressure till the edge of detected knock.

    This will increase performance.

    You can run either in the VT. Your choice.

    BTW, 87 is more powerful then 93 octane.

    93 is a cooler burning fuel. Contains less BTU;s. = The Turbo VT will take full advantage of this. The cooler fuel benefits outweigh the BTU level.
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  18. #17
    Junior Member Jerm's Avatar
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    I use 93

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    Does anybody have any proof to either side of this argument? I feel like we have several people on each side providing valid *sounding* arguments but we have no evidence at this point....
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  20. #19
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    Quote Originally Posted by g4ebguy90 View Post
    Hi guys, easy answer to this.

    In a turbo car, especially these days with all the electronics, the lower octane fuel you put in, the less performance, and EVEN possibly economy can suffer.

    Hyundai was very conservative picking a 9.5:1 Compression ratio for the engine. Honestly they could have probaly got away with 10.5:1 or higher... But they wanted that 87 octane use.

    If you put low octane in (87) your engine will retard ignition timing, and lower boost to a non-knocking level.

    Premium will let your CPU, advance timing, and increase boost pressure till the edge of detected knock.

    This will increase performance.

    You can run either in the VT. Your choice.

    BTW, 87 is more powerful then 93 octane.

    93 is a cooler burning fuel. Contains less BTU;s. = The Turbo VT will take full advantage of this. The cooler fuel benefits outweigh the BTU level.
    Sounds logical, think i'll stick with 93 until someone posts the opposite logical reason to not use it, other than burning some extra $$

  21. #20
    Senior Member letigre21's Avatar
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    87 because I'm cheap. But I did use 91 in my Audi A4 and noticed an increase in MPG.
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