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91 or 89 octane?

Discussion in '3rd Gen. Tacomas (2016+)' started by chucknris, Jul 29, 2018.

  1. Jul 29, 2018 at 9:35 AM
    #1
    chucknris

    chucknris [OP] Member

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    I did a quick search and didn't find anything, so I apologize if this has a thread somewhere. Just was looking into the specs of my '18 TRD Taco OR. Apparently the 3.5L has a 11.8 compression ratio??!?! 87 is stated as acceptable. Was wondering if anyone has tried higher octane fuel to see if it would get better fuel mileage so the computer wouldn't be adjusting the timing so much to avoid detonation. Or maybe technology has surpassed this theory?

    Anyway, thought I'd ask if anyone had tried. Thanks in advance. :cheers:
     
    KTJO 4x4 likes this.
  2. Jul 29, 2018 at 9:36 AM
    #2
    chucknris

    chucknris [OP] Member

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    And yes I'm a dork.
     
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  3. Jul 29, 2018 at 9:39 AM
    #3
    hiPSI

    hiPSI Laminar Flow

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    You will get a slight increase in economy and performance by running 91. However, not enough to offset the additional costs of the 91 itself. 87 works just fine as these trucks are pretty smart.
     
  4. Jul 29, 2018 at 9:43 AM
    #4
    chucknris

    chucknris [OP] Member

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    Thank you, suspicion confirmed. :thumbsup:
     
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  5. Jul 29, 2018 at 10:04 AM
    #5
    KTJO 4x4

    KTJO 4x4 Well-Known Member

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    Yes. Higher octane does get better gas mileage
     
    chucknris [OP] likes this.
  6. Jul 29, 2018 at 11:49 AM
    #6
    hiPSI

    hiPSI Laminar Flow

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    Not the octane lol, what your truck does to the timing with respect to the octane is why.
     
  7. Jul 29, 2018 at 11:52 AM
    #7
    Dacon

    Dacon 2017 Tacoma TRD PRO Quikrete

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    Used ONLY 89 Chevron.
     
  8. Jul 29, 2018 at 12:52 PM
    #8
    Bertw192

    Bertw192 Well-Known Member

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    I use 92. Mostly because my other car and motorcycles require 92 and I've made a habit of pumping 92. For the minor cost difference, it's peace of mind knowing that I'm not going to screw something up.
     
  9. Jul 29, 2018 at 1:18 PM
    #9
    mds08

    mds08 Well-Known Member

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    I too use 93, because it's required on my other vehicles. So I use it also in my taco as well. I avg about 23 to 24 all the time. I haven't done a long trip in it yet and probably won't be taking my truck if we do.
     
    Stryker420 likes this.
  10. Jul 29, 2018 at 1:20 PM
    #10
    El Duderino

    El Duderino Yeah,well, that's just, like, your opinion, man.

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    87 cause that’s what the manual says.
     
  11. Jul 29, 2018 at 3:18 PM
    #11
    emund

    emund Well-Known Member

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    I don't think there's really much to gain by going above the grade of what manufacturer says to use. But then again I live in CA and spent $4.25/gal for Chevron where I live, it's insane.
     
  12. Jul 29, 2018 at 3:23 PM
    #12
    e6400ultra

    e6400ultra Well-Known Member

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    87 octane for me. $3.50 per gallon is as high as I wanna go, while I can.
     
  13. Jul 29, 2018 at 3:56 PM
    #13
    ElGatoLoco

    ElGatoLoco Well-Known Member

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  14. Jul 29, 2018 at 4:18 PM
    #14
    Xena1

    Xena1 Well-Known Member

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    I use 89 octane non-ethanol with a few 93 octane fill ups when I want to splurge. Mileage and performance has been great. Get 20-22 around town and 24 on trips. Paid 3.19 per gallon today.
     
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  15. Jul 29, 2018 at 5:07 PM
    #15
    Technique

    Technique Well-Known Member

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    I've ran 85, 87, 88 ethanol free and 91 octane...and I've personally noticed no difference in how the truck drives or MPGs.
     
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  16. Jul 29, 2018 at 5:59 PM
    #16
    My_Name_is_Rahl

    My_Name_is_Rahl It's ok to have a stock Taco, right?

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    What about putting 87 in it and buying octane booster?
     
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  17. Jul 29, 2018 at 6:03 PM
    #17
    phsycle

    phsycle Well-Known Member

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    Just send me $6 every time you’d fill up and you’ll have the same effect.

    I use 85 up here in high elevation. Noticed no difference from 87/91
     
  18. Jul 29, 2018 at 6:05 PM
    #18
    Rooster OG

    Rooster OG Well-Known Member

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    The truck isn’t tuned from the factory to take advantage of higher octane fuels, there’s no real reason to use them.
     
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  19. Jul 29, 2018 at 6:17 PM
    #19
    Simpleton

    Simpleton Well-Known Member

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    neither. 87 like the manual states. go ahead if you like burning money. The engine wasn't designed to use the higher octane and thus will have no performance gain. you are not damaging the engine using a lower octane (again because that is what it was designed to use)
     
    Amanelot likes this.
  20. Jul 29, 2018 at 7:19 PM
    #20
    shakerhood

    shakerhood Well-Known Member

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    I finally found a station that had ethanol free so I filled up, didn't really notice any difference either other than the HPFP did not chirp.
     

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