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Honda: use of higher octane gasoline

  1. #1
    John
    Guest

    use of higher octane gasoline

    I have a 1999 Honda Accord LX six cylinder with about 31,000 miles on it. I
    have always used unleaded gasoline 87 octane (manual says use 86 or higher)
    and had no problems. However a friend of mine said I would get better
    performance and mileage if I used premium grade higher octane gasoline.
    Other than paying a higher price per gallon is there really any difference
    in performance or mileage using higher octane fuel if the compression ratio
    remains unchanged?
    John



  2. #2
    Elmo
    Guest

    Re: use of higher octane gasoline

    In article <com>,
    "John Shamblin" <net> wrote:
     

    He's wrong.

    Have him show us his degree in chemistry, and his certifications from
    the auto engineering or petroleum industries. What? He doesn't have
    any? Imagine that.

    He's wrong.

    In your case, there's no difference other than (a) you'll spend more
    money, and (b) you'll actually get slightly *in*ferior gas mileage and
    power due to the higher octane fuel's requirements for burning.

    Do you know what octane is? Better yet, let's ask him. Does HE know
    what octane is?

    Octane is not a "power booster".


  3. #3
    Tony
    Guest

    Re: use of higher octane gasoline

    Hi,
    Would you believe your friend's advice or the owner's manual?
    Have money to burn? You said your car is running fine.
    Tony

    John Shamblin wrote: 


  4. #4
    Pete
    Guest

    Re: use of higher octane gasoline


    "John Shamblin" <net> wrote in message
    news:com... 

    higher) 

    Apparently if you use the 93 oct gas, you get 10 extra hp from the new V6
    240hp Honda engine, according to some Honda engineer. Not sure about better
    mileage though. However, I haven't heard anything of this sort about the
    older 200hp V6 engine. Personally, I'd stick with the 87 octane.

    Cheers,

    Pete




  5. #5
    Elmo
    Guest

    Re: use of higher octane gasoline

    In article <bki6v1$qdr$onet.pl>,
    "Pete" <com> wrote:
     

    Ah, the net. Great source for random crap.

    Other than this anonymous Honda engineer that no one has ever actually
    seen or talked to, is there any other source for this? No, I didn't
    think so.

    And even if this were true, it would be true IF and ONLY IF the engine
    control computer were designed specifically for this situation.

    This guy's 99 Accord most definitely isn't designed for this.


  6. #6
    Pete
    Guest

    Re: use of higher octane gasoline


    "Elmo P. Shagnasty" <com> wrote in message
    news:Eg1bb.89452$atl2.webusenet.com... 

    Yup, it's pretty much a hearsay. I wouldn't bet my life on it, that's for
    sure.

     

    It may be smart enough to adjust timing - many ECUs can do it these days.
     

    Didn't I say it only applied to the new V6 (2003 and up)? ;-)

    Cheers,

    Pete





  7. #7
    Paul
    Guest

    Re: use of higher octane gasoline

    "Pete" <com> wrote in
    news:bki9o7$2vj$onet.pl:
     
    VTEC The VT stands for variable timing. The 2003 models will adjust
    themsleves to the octane used. Is 10hp worth $0.20+ per gallon? Not to
    me. My V6 Accord runs just fine on 87.

  8. #8
    Ed
    Guest

    Re: use of higher octane gasoline

    "John Shamblin" <net> wrote in
    news:com:
     

    The Octane number means resistance to detonation.
    Higher Octane does not mean higher energy content in the gasoline.

    Some engines (for example the Mistubishi 6 cylinder), can adjust to higher
    Octane gasoline. By using the knock sensor, they can sense the higher
    Octane number, then advance the ingition or something that would give you
    more HP.

    AFAIK, the stock Honda engine cannot make use of higher Octane than 87.
    Older, worn and/or modified engines MAY benefit from higher Octane. You may
    want to try to switch gasoline and determine for yourself. YMMV.

  9. #9
    Elmo
    Guest

    Re: use of higher octane gasoline

    In article <bki9o7$2vj$onet.pl>,
    "Pete" <com> wrote:
     

    But generally not in family haulers.


  10. #10
    Elmo
    Guest

    Re: use of higher octane gasoline

    In article <127.4.25>,
    Paul Cardoza <net> wrote:
     

    And just where is this documented?

    It's not a feature of VTEC. If that were so, my 92 Civic Si would have
    done that. And it didn't.

    No, it's a feature of the engine control computer, pure and simple.
    Nothing more, nothing less. It's how the computer is programmed to
    respond to certain sensory inputs.

    That the engine has variable valve timing and lift control doesn't mean
    the computer that controls it was programmed to do anything with higher
    octane fuel. The two have nothing to do with one another.

    I'm still waiting for Honda documentation that says the 03 Accord V6
    will advance its timing in response to higher octane fuel. So far, it's
    just a net rumor. And you know what those are. They're like
    opinions--and you know what THOSE are like.



 

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