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I observed about a 10% loss in MPG in the '96 Subaru Legacy when Oregon mandated E10. This doesn't make sense though since the ethanol content was only 10%. My observation of MPG decrease was as if 10% of the fuel was replaced by water.
I'm guessing my observation was skewed by other variables, and that the real loss was perhaps only 5%.
Ethanol for fuel in the States doesn't make sense. Perhaps it makes more sense in tropical climates, and for vehicles optimized to run that fuel.
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