Running 91 octane

Discussion in '2005 - 2015 Toyota Tacoma' started by TacoBOB77, Jan 26, 2019.

  1. TacoBOB77

    TacoBOB77 Well-Known Member

    Anyone run high octane and feel a big difference in throttle response and performance? Especially with chevron?
    because I Do!!
    B-Man likes this.
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  3. bdarnold12

    bdarnold12 Well-Known Member

    I haven't yet but been thinking about it. Ive only got 700 miles on mine and been running 89. I dont know if its just because I'm getting a few miles on mine or the dealer had filled it up with some cheap stuff but mine is smoother with the 89.
    TacoBOB77 likes this.
  4. texasred

    texasred Well-Known Member

    My ‘17 v6 had gas mileage drop 2 mpg after 2 tanks of 91 octane. As it’s getting used to 89 octane again, mpg is improving.
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  5. bdarnold12

    bdarnold12 Well-Known Member

    Maybe I'll just stay with 89
    B-Man likes this.
  6. Bojangles

    Bojangles Well-Known Member

    I never ran anything but 91, shell, Chevron, sometimes mobil.

    Think your gas is clean tho? It's not
    If u are rlly concerned about the quality of your fuel, get a remote fuel filter relocation kit from

    This is what 30k miles of premium fuel looks like from Kalifornia.
    20170125_134550.jpg 20170125_102640.jpg
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  7. texasred

    texasred Well-Known Member

    89octane from Shell.

    But I’ve never put it in a glass....does 91 octane taste better than 89?
    OR17TRD, B-Man and Bojangles like this.
  8. Bojangles

    Bojangles Well-Known Member

    I dunno, but I can say it's cold as **** on the skin.
    I can also say the lady didn't seem to notice one of her glasses was missing

    Also, the trucks never had anything lower than 91 and won't use anything lower unless someone does some major work under the hood. So, no clue on 89 taste
    Last edited: Jan 26, 2019
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  9. whippersnapper02

    whippersnapper02 Negative Nancy

    Unless your state uses less ethanol in the higher octane, there will be no difference.
    Bogunn, B-Man, texasred and 1 other person like this.
  10. Crawdad

    Crawdad Well-Known Member

    If you want to pay the extra bucks to run 91, get a tune to make it worthwhile...
    That's my two pennies...
  11. OR17TRD

    OR17TRD Well-Known Member

    Delicious morning smoothie :D
    texasred, Bogunn, B-Man and 1 other person like this.
  12. I've filled up with 91 many times. No difference... non ethanol fuel yes tho
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  13. OP

    TacoBOB77 Well-Known Member

    Same engine? 4.0 V6? 2nd gen
  14. 3rd gen 3.5
  15. OP

    TacoBOB77 Well-Known Member

    Thats prolly why i definately feel a difference plus everything is newish on my truck its running superb..and like i said especially on the 91 from chevron
    texasred likes this.
  16. JASN

    JASN Well-Known Member

    That's all I run is 91 I haven't felt the difference but mostly I run it in the winter and 89 in the summer.

    Sent from my SM-G892U using Taco Forum mobile app
    texasred, TacoBOB77 and B-Man like this.
  17. TacoKen

    TacoKen Well-Known Member

    I have run 87 and 91. 2015 4x4 V6. I didn't get any better mileage and no noticeable performance. I only use Chevron. Currently staying with 87 as price of gas in California is much higher than most if not all states.
  18. Bogunn

    Bogunn Well-Known Member

    I’ve only ran 87 for almost 20 years. I get 21-23 highway in my turd gen. And that’s in the mountains so I can’t complain.
  19. Crawdad

    Crawdad Well-Known Member

    This is my personal preference, still a tad cheaper than the 91but 91 still has ethanol so I stick with the 87 tune and run this. Feels a tad more peppy and seems to give another mpg or so even while stomping on the long peddle all week. 20190127_134606.jpeg
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  20. OP

    TacoBOB77 Well-Known Member

    I only fill up on 91 on payday lol i agree im also in CA
    Bogunn, texasred and B-Man like this.
  21. lcarrasco212

    lcarrasco212 Well-Known Member

    I get better fuel mileage on 87. Power felt the same. I use Texaco the most

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