can someone tell me why my figures dont add up.? what did I do wrong.?

1 gallon approximately = 128oz
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1% of 128 = 1.28oz (castor oil)

18% of 128 = 23.04oz (synthetic oil)

10% of 128 = 12.8oz (nitro)

69% of 128 = 88.32oz (Methanol)


Add 1.28 + 23.04 + 12.8 + 88.32 = 125.44oz = 1Gallon

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FAI Fuel
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1 gallon approximately = 128oz
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70% of 128 = 89.6oz (Methanol)

20% of 128 = 25.6oz (synthetic oil)

Add 89.6 + 25.6 = 115.2oz = 1Gallon