91 vs. 93 Octane
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Thread: 91 vs. 93 Octane

  1. #1
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    ErikBEggs's Avatar
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    91 vs. 93 Octane

    Ok, let me start off by saying this only applies to tuned users only.

    GM's official fuel rating for the Cruze is 91 Octane, so running 93 Octane most likely won't make a difference. However, I have noticed an increase in performance between 91 and 93 octane on both eco and sport mode of the trifecta tune.

    For starters, 91 Octane is only available through select retailers on the east coast. Sunoco is a popular one that offers both 91 and 93 octane. I made the switch to 91 Octane from 93 two years ago because Trifecta told me it was "safe" and there is anywhere from $.2 / gal to $.10/gal savings between the grades depending on the station. I first noticed last summer that my dyno was performed on 91 Octane, which resulted in stock and trifecta achieving closer numbers than anticipated. I aslo noticed my quarter mile and 1/8 mile times dropping from when I first bought the tune and was blindly using 93. I consistently run a 10.2 @ 70 and 15.8 @ 87 in the eigth and quarter mile on 93 octane. Since I've been running 91 for about a year now, last year my times were around 10.5 @ 67 and 16.1 @ 85 and I couldn't figure out what the **** was going on. I thought it was just heat soak and my cool air intake not doing anything.

    About two weeks ago I grew some balls and put some 93 in the take and was floored that there actually was a difference. The car is stronger especially in the summer on 93. I emailed Trifecta and Vince told me when he crafted the tune he was running 92 because that is all that is available to him and that although 91 is "safe" the car is most likely pulling timing even on 91. 92 Octane maybe the "high octane" table threshold for the higher boost of the tune.

    Conclusion: don't be a cheapa$$ like me. Run 93 Octane if you are tuned and sorry Cali boys you may want to invest in some octane booster.

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  3. #2
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    Ultra 94 is making my engine very very happy. Even dropping to 91 hurts at times, but regular is RIGHT OUT. The thought of putting in 87 makes me cringe. Car is completely gutless on 87.

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  4. #3
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    91 is probably what Vince says because that's about the lowest premium octane you'll find in the US. I have never seen anything higher than 91 in Colorado and until recently, even 91 wasn't available at a lot of stations.

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  5. #4
    1st Gear Rocky87's Avatar
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    I'm stock and I only run 93, and I can feel a difference. I can only imagine you tuned guys

  6. #5
    Learning about my Cruze Vinny's Avatar
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    I use 91 octane, but Cali isn't completely out of hope. I did come across a Arco gas station in Anaheim that carries 92. I use it every chance I can! They're out there...just gotta check them all out! lol

  7. #6
    Handbrake Released Markj2222's Avatar
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    Even with water injection, i notice a difference between 91 and Ultra 94.

    Use torque (app) to watch the timing / engine load. Interesting stuff.

    Heat makes a huge difference too. In winter when its below 20, i can't tell the difference between 87 and 94.
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  8. #7
    2nd Gear Ru5ty's Avatar
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    thanks for the info eric. but what is the official trifecta recommended octane for the tune? cause we only have 91 out here as far as i know. now im going to have to look around for the highest in my region :P
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  9. #8
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    The tune simply says "Premium Octane (91+) required!" 91 Octane is safe yes, optimal no.

  10. #9
    6th Gear giantsnation's Avatar
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    Couldn't agree with you more! I run Sunoco 93 almost exclusively (every once in a while I have to go a Hess). Never tried 91 but for the gas stations near me the $ difference between 91 and 93 is .02c which equals out to less than a quarter more a fill up - not a big deal.

  11. #10
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    Couldn't agree with you more! I run Sunoco 93 almost exclusively (every once in a while I have to go a Hess). Never tried 91
    - Only 93 for my tuned Cruze - Shell or BP, sometimes Sunoco. Do not want to chance lower octane.
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