93 Octane! I like it!

  1. PizzaFreak

    PizzaFreak Well-Known Member

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    My new Jeep has around 1500 miles on it so far. My first fill ,Costco had the 93 for the same price as the 87. So I thought why not. It was the same on the next fill. I guess I got used to it because I tried the 87 for one fill and hated it. I thought the difference in the way the Jeep ran was huge. I have run 93 ever since. Anyone else experience this, or am I just imagining it?
     
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  2. RubiZ

    RubiZ Well-Known Member

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    I noticed that mine runs smoother with 91 for sure. Never tried 93 yet
     
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  3. MORTON

    MORTON Well-Known Member

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  4. DougJaneway

    DougJaneway Well-Known Member

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  5. Pic18

    Pic18 Well-Known Member

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    Is this the 4 or 6 cyl?
     
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  6. Litfuse

    Litfuse Well-Known Member

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    This can be an issue with the turbo 4 but not the 3.6. The 3.6 can run on pee and vinegar.
     
  7. WXman

    WXman Well-Known Member

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    The 3.6L loves higher octane too. Over the past five years and three 3.6L engines in three separate FCA vehicles, I've seen good results in smoothness, power, and fuel efficiency with higher octane fuels. Today's smarter ECUs will adjust VVT and take advantage of whatever you put in the tank.

    In short: Just because the Pentastar will run fine on 87, that doesn't mean that it won't run better on 91 or 93.
     
  8. Litfuse

    Litfuse Well-Known Member

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    You would need to see datalogs to truly see what is going on. The buttdyno is not good enough.
     
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  9. xeon

    xeon Well-Known Member

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    Over the past 22K miles in my JLUR i have found that I average 2 to 2.5 miles per gallon better fuel economy than if I run 93 vs 87. After a dealer tune up at 20K miles....the results are slightly lower...1.8 to 2.2 but still better. However the responsiveness, especially in cold weather is far better. So for me it depends on the cost of fuel that day. Quick math if 87 is $3.25 and I get 16 miles /gal. = $0.2 and if 93 is at $3.50 this would yield $0.19 so better to get 93 as long as the cost/mile is less. For me the other benefits would even have me go a bit beyond the equal point but the starting price of fuel can make a difference. When gas is more expensive the cost of using 93 is even better. Its not until gas prices are low that 87 wins out...but here in CA I haven't seen prices that low in a long time.
     
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  10. Jeepmarkjl

    Jeepmarkjl Well-Known Member

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    I did the exact same thing. 93 octane (Costco) engine seems to perform better. Not sure if that true but I’ll roll
     
  11. zgn

    zgn Well-Known Member

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    The manual explicitly says "there is no performance benefit to using a higher octane than 87." It doesn't say "it will run fine on 87", it says there is absolutely no point in using higher octane than 87 cause the engine cannot utilize it.
     
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  12. nerubi

    nerubi Well-Known Member

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    Give up trying to convince some people that they are getting more power or better mpg with higher octane for the 3.6 or the people with the 2.0 getting same power and mileage on 87 instead of 91/93. They think without controlled conditions to accurately determine those factors they can tell the difference. Their butts have degrees in engineering.
     
  13. wv18jl

    wv18jl Well-Known Member

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    15% increase in mileage with higher octane?
    In a 4 door with oversized tires?
    It's a miracle.
     
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  14. Litfuse

    Litfuse Well-Known Member

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    Lol. I have a doctorate in buttdynoist.

    I have tuned myself or worked with a licensed tuner to tune my vehicles many times. You can think your car is running great or “better” and then you look at the logs and you realize your wrong. One car for example kept pulling timing and reducing power on the top end. I thought it was gas quality. It ended up being false knock created by a bolt on my exhaust that radiated through my exhaust and triggered a sensor. There isn’t a person on this forum that could sense that.

    And don’t start comparing gas mileage by 1-1.5 miles. That can be a factor of wind, temperature. Too many factors to list.

    Are there any engine tuners in here that want to share a word?
     
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  15. Jeepmarkjl

    Jeepmarkjl Well-Known Member

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    I dont think I have more power with 93.
    It just feels smoother and the rattle hiccup quick cough on acceleration is gone.

    Now... my brakes are squeaking with only 6000 miles on them so thats a different story.
     
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