Quote:
Originally Posted by thomason2wheels
So in pther words the octane kick from the ethanol combined with lower grade gasoline gives more overall btu content?
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In a round-about way, yes, but the "...more overall BTU content..." comes more from the density of the lower octane gasoline feedstock, which they *blend* UP with enough ethanol (typically less than 10% as E10 label states) to achieve 87 octane rating...plus (or minus) the butane they add/subtract for winter/summer RVP control per EPA regulations.