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Just to clear the air a bit: "E85 has an octane rating of 100–105 compared to regular gasoline's typical rating of 85–93. This allows it to be used in higher compression engines which tend to produce more power per unit of displacement than their gasoline counterparts. Since the reciprocating mass of the engine increases in proportion to the displacement of the engine E85 has a higher potential efficiency for an engine of equal power." However claiming to get 4X MPG out of a fuel with less BTUs is asking too much.
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