GM confirms use of 91 Octane Fuel
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Thread: GM confirms use of 91 Octane Fuel

  1. #1
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    GM confirms use of 91 Octane Fuel

    I haven't see this posted, but seeing that GM actually confirms using 91 octane is better I thought I would link it.

    2011 Chevrolet Cruze: Hot Weather MPG Part 2

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    Supporting Vendor TurboTechRacing's Avatar
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    Interesting.
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    It may be why people are seeing a decrease in fuel efficency this summer. I haven't but I have been running 93 octane since June

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    BOOOOST! limited360's Avatar
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    Car is globally calibrated for 96 octane which is used in Europe... We get heavily retarded spark in summer and on low octane.. hence reduction in MPG

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    2nd Gear bartonmd's Avatar
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    Yeah, could have guessed that... I get noticably better mileage when it's 70F with the A/C on than I do when it's 95F with the AC on...

    Mike

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    ...FYI, *all* EPA 50-state-certification tests are performed using 91 octane fuel, regardless of what the Owners Manual says.

    ...93 octane is used for non-CARB and non-50-state EPA tests.
    Last edited by 70AARCUDA; 07-28-2011 at 05:22 PM.
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    1st Gear RS LTZ's Avatar
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    This really applies to all vehicles, not just our Cruze. Although, it impacts on a lesser of scale on N/A engines.

    Think about it. The hotter the air, the less dense the air, the easier it is for the A/F mixture to detonate and the less power made. Add a Turbo/SC, and it compounds that effect.

  9. #8
    2nd Gear bartonmd's Avatar
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    Quote Originally Posted by RS LTZ View Post
    This really applies to all vehicles, not just our Cruze. Although, it impacts on a lesser of scale on N/A engines.

    Think about it. The hotter the air, the less dense the air, the easier it is for the A/F mixture to detonate and the less power made. Add a Turbo/SC, and it compounds that effect.
    Sort of...

    If an engine has a low compression ratio and a set high-point for ignition advance that's in the 87 octane range, and almost never retards timing, then there's really nothing to gain from higher octane... The Trailblazer, for instance, gains absolutely nothing from anything over 87... It's because the compression ratio isn't really high, and the maximum advance on the timing is well within the 87 octane range...

    The engine controls the fuel to go with the temperature/density of the air... It puts in less fuel when it needs less fuel...

    Mike

  10. #9
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    Interesting. Mine is going in tomorrow for maintenance and to see if they can figure out why it has absolutely no power at times when hot. It has been 100+ here for 2 weeks and the car will barely get out of its own way. If the dealer can't find anything, I may run a few tanks of 91-92 to see how it works. I drive 3000+ miles a month and keep track of everything. I'll be able to tell pretty quickly if it works.
    2011 Black Eco M6

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    As for at potential energy from gasoline, BTU is 87 > 89 > 91 > 93. Ideally you would want a car to use 87 because it provides the most energy.

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