Optima SX: FUEL GRADE vs MPG - Page 7
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Thread: Optima SX: FUEL GRADE vs MPG

  1. #61
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    Quote Originally Posted by georgelv1999 View Post
    When I bought my car they told me I had to have the 91 (best I can get) completely out before I can switch to anything else. Is this true?
    no, you can mix grades just fine. Your ECU adjusts from feedback from sensors pretty quickly actually.
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  3. #62
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    87 is widely used for lots of engines now. I had a Chrysler 200 which used 89, that was weird to me. LOL

  4. #63
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    Quote Originally Posted by georgelv1999 View Post
    When I bought my car they told me I had to have the 91 (best I can get) completely out before I can switch to anything else. Is this true?
    That information is wrong.

    The Optima can use any grade of gas from 87 to 93, maybe even 100 octane racing fuel without any problems.

    Having a mix of 87 and 91 would give you a octane number somewhere in the middle so your engine will still work fine.

    Note: Even though a lot of people think that the car can run only on 87 octane gas; wrong, the owners manual says use at the minimum 87 octane, not at the most.
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  6. #64
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    Everyone's talking about 87 and 91 when the answer lies in the middle and beSt of both worlds 89. When you are given a trinity in a dualistic realm the answer is always balance.

  7. #65
    Riding Lawn Mower TurboJeff's Avatar
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    Quote Originally Posted by OptimaInThe6 View Post
    Everyone's talking about 87 and 91 when the answer lies in the middle and beSt of both worlds 89. When you are given a trinity in a dualistic realm the answer is always balance.
    Depends on how the ECU works in the car. Most newer vehicles can adjust performance and economy depending on the octane used.

    Sent from my SM-G920T using Tapatalk

  8. #66
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    I have a 14 LX but i've been running 93 Since December and to me the Engine feels more responsive and revs up a little smoother, then again, i don't have the 2.0 and it just might be me being stupid but i've seen a difference, so far haven't had problems running 93 at all.

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