A research center in Finland recently did a study on the efficiency penalty of going from E5 fuel to E10 fuel. They had reports of huge drops in mileage (sound familiar?) from going to E10. While the fuel consumption penalty does differ from engine to engine. The average penalty is a measly .7%. I can't imagine there being a much larger penalty to go to E15.
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The study involved six gasoline-driven cars loaned by VTT employees. The cars were of model years between 1999 and 2010 and, according to their manufacturers’ recommendations, compatible with E10-fuel.
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Green Car Congress: VTT study finds no significant difference in car fuel consumption between E10 and E5