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1.1 ,This specification covers butanol intended to be blended with gasoline at 1 ,% to 12.5 ,% by volume for use as an automotive spark-ignition engine fuel.
1.1.1 ,Butanol contains 22 ,% by mass oxygen. The mass percent of oxygen of a butanol blend with gasoline depends on the volume percent of butanol blended, the density of the butanol isomer, and the density of the base blendstock.