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88 octane

Discussion in 'Gen 3 Prius Main Forum' started by lssohn, Aug 12, 2009.

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  1. lssohn

    lssohn New Member

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    Since there is some confusion about what fuel the 2010 needs, here's my 2 cents worth.

    There IS 88 octane fuel available....it is "plus" at most stations, and rated at 89 octane.

    Just filled our second tank with "plus"....sometime next month we'll see if there is a difference.

    But, with such a high compression ratio, it would seem the gas engine needs as much octane as the system is set for.

    Around here with 10% corn juice, 87 octane is more like 85 or 86, my bet is the engine will run more efficiently on 89 octane, which is the functional equivalent of about 87 octane by the no corn juice calculation.

    Costs approximately $1.00 more per tank full.
     
    #1 lssohn, Aug 12, 2009
  2. 32kcolors

    32kcolors Senior Member

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    No, the 88 octane rating is a misprint in the manual.
     
    #2 32kcolors, Aug 12, 2009
  3. MaggieMay

    MaggieMay Active Member

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    #3 MaggieMay, Aug 12, 2009
  4. fuzzy1

    fuzzy1 Senior Member

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    I thought the compression ratio was a rather unexciting 8.5. The 13.0 number you see in print is an expansion ratio. Unlike a traditional Otto cycle engine, this is an Atkinson cycle engine, so valve timing allows the two figures to be different. And timing is also variable.
     
    #4 fuzzy1, Aug 12, 2009
  5. fred garvin

    fred garvin New Member

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    there really isn't any confusion - the six prior threads in PC dealing with this issue have made it clear

    google "88 octane" prius and the first result is:

    88 Octane for 2010 Prius - What's up with that? - PriusChat Forums
    10 posts - 8 authors - Last post: May 19
    It is being reported that 88 Octane or Research Octane Number 92 is required. I don't think the 88 is a misprint because normally the ...
    priuschat.com/...prius.../61874-88-octane-2010-prius-whats-up.html - Cached - [ame="http://www.google.com/search?hl=en&q=related:priuschat.com/forums/gen-iii-2010-prius-main-forum/61874-88-octane-2010-prius-whats-up.html"]Similar[/ame] [ame="http://www.google.com/url?q=http://priuschat.com/forums/gen-iii-2010-prius-main-forum/65273-88-octane.html&ei=wemCSoaMFYnIsQOlnISlAg&sa=X&oi=forum_cluster&resnum=1&ct=result&cd=1&usg=AFQjCNGDm1ZHQ7njngnL03qDXG2qAm2ZtA"]88 Octane?[/ame]‎ - Jul 14, 2009
    What fuel (Octane Rating) for Gen III ?‎ - Jun 27, 2009
    88 Octane for 2010 Prius - What's up with that ...‎ - Jun 21, 2009
    88 Octane for 2010 Prius - What's up with that ...‎ - Jun 2, 2009
    [ame="http://www.google.com/search?hl=en&q=+site:priuschat.com+%2288+octane%22+prius&ei=wemCSoaMFYnIsQOlnISlAg&sa=X&oi=forum_cluster&resnum=1&ct=more-results"]More results from priuschat.com »[/ame]



    Please stop telling people to use 89 octane
     
    #5 fred garvin, Aug 12, 2009
  6. Paradox

    Paradox Prius Enthusiast / Moderator
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    CLOSED. This whole topic has it's own thread with an answer straight from the Prius Team about using 87 octane. Continue it there if you must.
     
    #6 Paradox, Aug 12, 2009
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