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Thread: Octane Mixing thoughts?

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  1. #1
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    Octane Mixing thoughts?

    In a brief survey of web stuff I see a Mobil1 mfg's website that states(automotive myths) if mixing octanes into an empty tank they have different densities & so they say to be certain you do 1/2 into 1/2 to avoid them not mixing. I find that being double talk? It would seem to me that they either mix or they don't? What am I missing? www.Mobiloil.com -put "octane" in the search window, then see "automotive myths".
    On a Wallace racing site www.wallaceracing.com they have a calculator allowing the formula to give desired final octane from whichever octanes based on total capacity. No further mention of what if stuff there.
    It's also hard for me to imagine a bike tank not agitating the fuel enough to mix it , no matter the empty vs. 1/2 full idea.

  2. #2
    IBA #44567 Ken F's Avatar
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    I've done it for several years now when racing the boat, however I use 104 racing fuel mixed with 89 octane to raise the octane when 91 is not available.

    Just about any fuel supplier where you can find 104 can tell you the formula for raising the octane to different levels.

    Ken
    IBA #44567
    "Two things are infinite: the universe and human stupidity; and I'm not sure about the the universe."
    -Albert Eienstein

  3. #3
    Small road corner junkie pffog's Avatar
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    I liked the sugar myth, it states "Back in 1994, researchers at Berkeley figured out sugar doesn’t dissolve in gasoline"

    Heck they should have called me! I tried to do this over 45 years ago when I was about 10. I had an old REO motor off my grandfathers 50's lawn mower I use to play with, and I wanted to see what would happen, after hearing the sugar rumor. I dumped sugar in the tank and ran it till it ran dry, all it did was leave a pile of sugar in the bottom of the tank.

    That motor was my mechanical "teething ring" Learned a lot taking it all apart and putting it back together, playing with the carb etc. Many a burn from the exhaust and ruined clothes from the oil. I pity the youth of today that just play on the computer all day.
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  4. #4
    na1g
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    As soon as you ride/drive off, the sloshing fuel is going to mix nicely. I have noted that Techron and other fuel system additive tell you to put that in the tank first, then fill it with gas. Can't imagine that is necessary either.

    p

  5. #5
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    In a brief survey of web stuff I see a Mobil1 mfg's website that states(automotive myths) if mixing octanes into an empty tank they have different densities & so they say to be certain you do 1/2 into 1/2 to avoid them not mixing. I find that being double talk? It would seem to me that they either mix or they don't? What am I missing? www.Mobiloil.com -put "octane" in the search window, then see "automotive myths".
    I once worked for a oil distributor. This included Mobil Oil franchises. You can't believe too much of what comes out of their mouths. In many cases, gas brands like Mobil, just distributes the gas. Refineries owned by different companies make the gas. All the gas comes from the refinery and goes into same distribution tank, and is distributed to different franchises (Gulf, Texaco, Mobil, etc). In our neck of the woods, Sunoco refined and distributed their own gas. We considered Sunoco superior to ours. I am sure there are others out west that may be like Sunoco.

    In regards to this statement. The oil industry hates it when people mix gas octanes. They feel cheated out of profits. Even if there was some truth to Mobil's claim of different gas octanes settle out to different densities, the movement of the vehicle would mix it up. Today some oil distributors blend their own gas to different octanes, dyes, and mixtures (summer / winter blends).

    In my opinion, mixing octanes should not be a problem. People have been doing it for decades.

  6. #6
    Registered User lkraus's Avatar
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    Around here Sunoco used to have pumps offering four or five octane options. My understanding was that they had only two storage tanks, one a very low octane (about 2 points below "regular") and one high octane, and the pump mixed them in varying proportions. This may have changed. I stopped going to their stations because I felt I was getting suckered when their "regular" price was below all the other area stations - usually a comparable octane cost more than the station on the other corner.
    Larry
    2006 R1200RT

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