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Thread: octane

  1. #1
    CADYSHAK is offline Cadillac Owners Member
    Automobile(s): 2009 CTS-V
    Join Date
    Mar 2009
    Posts
    98

    octane

    Need opinions on octane recommendation . In ontario we have 91 V-Power shell (no ethanol) and 94 Sunoco (10% ethanol). Which one would you use ?


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  3. #2
    Looney100 is offline Cadillac Owners Member
    Automobile(s): NONE
    Join Date
    Jul 2009
    Posts
    61

    Re: octane

    Do you have any modifications tha tmight make you believe you need more than the 91 ocyane the owners' manual recommends?
    HIgher octane ratings will do nothing for you (except lighten your wallet) if the lower octane rating doesn't cause premature detonation.
    Another thing to keep in mind is that ethanol has a lower BTU content than gasoline (i.e. less power), so your computer compensates by dumping more fuel into the cylinder resulting in increased consumption on top of the premium you paid for the gasoline.
    IF you have software or some other way to determine how much knock you're getting you can compare the 91 vs. 94 octane, or compare your performance at the track with the two fuels. If the 94 provides you with some benefit go for it, otherwise save yourself the cash and stick with the 91.

  4. #3
    CADYSHAK is offline Cadillac Owners Member
    Automobile(s): 2009 CTS-V
    Join Date
    Mar 2009
    Posts
    98

    Re: octane

    Some good points here Looney100 , the manual suggests 91 or higher , and for best performance the manual suggests 93 octane . I've not used any gasoline with ethanol in it , period . I've only used shell 91 V-power at this point . However , I imagine that some people on this board have compared the two gasolines here so I would like to get their opinions .

  5. #4
    vperl is offline Cadillac Owners Enthusiast
    Automobile(s): Cadillac 2009 CTS-V Radiant Silver
    Join Date
    Aug 2008
    Location
    Clackamas, OR
    Posts
    867

    Re: octane

    totally unscientific, but Iseem to get real crappy mileage on low octane.or ethonol, which is mandated..
    shell .... seems to have .... better mileage

  6. #5
    Caroutisine is offline Cadillac Owners Enthusiast
    Automobile(s): 2005 STS V8
    Join Date
    Dec 2006
    Posts
    522

    Re: octane

    I use the 91 V-Power


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