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  1. #1
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    How to properly add higher octane fuel

    So I have heard stories about how to mix fuel and am looking for concrete advice. I am looking into just running a 93 octane tune, however we only have 91 octane pumps within 160 miles. There are however VP vendors that carry 100 octane. I've done the calculations for my octane goals, now the question is how should the car be filled?

    Should the fuel going in be mixed first? Should it be 100 octane first and then 91 or 91 then 100 octane? I've heard a few different stories from people that run E85, although most just pump the E85 and then pump the regular gas. Here's what the calculator told me for reference.

    93 octane is the goal so, 3.78 gallons of 100 octane, and 13.22 gallons of 91 will give me the proper mix for 17 gallons.
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    I mix 50/50 e85 and 93 and I've filled different ways...the e85 first the 93 first, etc. Basically I just make sure I drive around for 10-15 mins before doing any WOT pulls to redline. Never had any issues. Just use common sense and drive around for a little so the fuel gets mixed up in the tank...

  3. #3
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    round it up and do 4 gallons 100. doesnt really matter when you add it, once you start driving and it sloshes around it will ix just fine

  4. #4
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    Click here to enlarge Originally Posted by LostMarine Click here to enlarge
    round it up and do 4 gallons 100. doesnt really matter when you add it, once you start driving and it sloshes around it will ix just fine
    this
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    The fuel will all slosh and mix but why not just run straight 100 then if it's available?
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    4 Gallons of 100 to be safe..... I'd add that first just to make sure you get every bit of it in, then fill the rest with the 91 octane nearby. Then just give it ~10 mins to fully blend and you're golden
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  7. #7
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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    The fuel will all slosh and mix but why not just run straight 100 then if it's available?
    Costs mostly. I've been driving the M3 alot more lately. Almost too much.
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