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I cheated and looked on the net instead of guessing. Booster is likely either ethanol ( octane 113) , or aromatics xylene ( octane 117 ) , toluene (octane 114). I think these are R+M/2 octanes, but the sites were not specific. Jet fuels are very low octane because they are mostly kerosene with some naphtha . I think it is the naphtha that gives it a little ...

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