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Nerys,
You are wrong when you say your car is not designed to run on E10. 10% ethanol does not change the fuel properties that much, and ethanol runs just fine in SI engines, even with low compression and retarded timing such as yours must have. My long past 1976 Civic ran just fine on it.
As long as the octane rating is comparable, the most mileage loss you should expect from a properly tuned engine burning E10 is 1-2%.
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