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91 octane?

Discussion in '5 Lug' started by adam2180, Jan 8, 2012.

  1. Jan 8, 2012 at 4:53 PM
    #1
    adam2180

    adam2180 [OP] Well-Known Member

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    Is it worth while using 91 octane gas in my 5 lug?
     
  2. Jan 8, 2012 at 7:29 PM
    #2
    Joels98taco

    Joels98taco Well-Known Member

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    i doubt it will make much of a diference with such a small engine with no upgrades. but try it if you want? :confused:
     
  3. Jan 8, 2012 at 7:32 PM
    #3
    humanoid

    humanoid bite me

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    It wouldn't hurt, at least your wallet will be a bit lighter.
     
  4. Jan 9, 2012 at 12:00 PM
    #4
    adam2180

    adam2180 [OP] Well-Known Member

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    I have always used it because I have been told its cleaner gas.
     
  5. Jan 9, 2012 at 12:01 PM
    #5
    98tacoma27

    98tacoma27 is going full "SANDWICH" Moderator

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  6. Jan 9, 2012 at 2:21 PM
    #6
    adam2180

    adam2180 [OP] Well-Known Member

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    I'm listening.......
     
  7. Jan 15, 2012 at 4:48 PM
    #7
    adam2180

    adam2180 [OP] Well-Known Member

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    I filled it up with regular and didn't notice any difference.
     
  8. Jan 16, 2012 at 1:11 PM
    #8
    JDCPA

    JDCPA Well-Known Member

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    The computer on the 4.0 engine differentiates between octane and adjusts its performance accordingly. THe 2.7's computer does not. Any octane in excess of 87 is wasted money.
     
  9. Jan 16, 2012 at 1:40 PM
    #9
    adam2180

    adam2180 [OP] Well-Known Member

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    Yup, I'm a believer... Or a non-believer, you know what I mean.
     
  10. Jan 22, 2012 at 8:06 PM
    #10
    emt49126

    emt49126 Active Member

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    Thank you. I put high octane in the other day. Needless to say, I complain that it costed me 30.00 for less then 9 gallons. What is your thoughts on gas additives?:confused:
     
  11. Jan 22, 2012 at 10:19 PM
    #11
    the.sight.picture

    the.sight.picture Wishes he was in the woods.

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    Check out my build thread (Beginning of Money Pit)
    im pretty sure its 89 octane if u are running the v6. I can tell the differance when driving...much less torque
     
  12. Jan 22, 2012 at 11:09 PM
    #12
    VanCity4x

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    I get 3+ mpg better using 91 on my 4.0. Ive been told the same thing. Wouldnt make a difference in 2.7L
     
  13. Jan 22, 2012 at 11:27 PM
    #13
    Desert Rat

    Desert Rat Well-Known Member

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    Interesting...
     
  14. Jan 22, 2012 at 11:30 PM
    #14
    Warhorseforever

    Warhorseforever Will The Thrill

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    No. Search for the other threads present on the subject and read for days.
     
  15. Feb 18, 2012 at 11:53 AM
    #15
    lmikk12

    lmikk12 Active Member

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    Sorry if i am a little late on this but octane ratings on fuel is how they stand up to pressure and heat before igniting themselves,with a higher compression ratio you have to run higher octane fuel so there is no detonation. higher octane fuel will not give you any more power if that is what you are looking for.However using a lower octane fuel can cause preignition or detonation or "knocking" that is small enough that you won't feel it but enough for your motor to retard the timing to save itself, this results in lower mpg's and less power. all it takes is one very small ping, so 89 or 91 would be more of a preventative measure than anything else. This can happen in any motor high compression or low even with higher octane fuel, but its what 3 bucks a fill up, why not.
     
  16. Feb 18, 2012 at 12:56 PM
    #16
    2010TRDtaco

    2010TRDtaco Well-Known Member

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    Only use what your owners manual says, higher octane in a vehical not made for it will cause a build up in the combustion chamber and will eventually make the engine knock
     
  17. Feb 18, 2012 at 1:06 PM
    #17
    1TUFFTRD

    1TUFFTRD WTF

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    In my 2005 manual it says for best performance use 91:notsure:
     
  18. Feb 19, 2012 at 8:22 AM
    #18
    lmikk12

    lmikk12 Active Member

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    Really, did it say why? i have never heard of anything like that.
     
  19. Feb 19, 2012 at 8:31 AM
    #19
    lmikk12

    lmikk12 Active Member

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    I can see what you are trying to say but but carbon deposits are not cause by higher octane fuel they are either caused by a rich air/fuel ratio or oil consumption. but over time carbon deposits can make you vehicle knock.
     
  20. Feb 19, 2012 at 8:45 AM
    #20
    1TUFFTRD

    1TUFFTRD WTF

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    That's why I said my 2005
     

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