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Confusing gasoline E5/E10 situation

Since some time gas pumps have stickers indicating the type of fuel, where the number indicates the percentage of ethanol mixed in the gasoline. In most EU countries 95 octane fuel is E10 and 98 octane is E5, and E10 is the cheapest. But in Portugal it’s the other way around! But it gets more confusing, i bought E5 fuel and on the receipt it says it contains 10% bioethanol, i tried different petrol station and same result. I asked the people at the gas station but they just looked very confused and assured me they had the best fuel.. Does anybody know what is going on? My car doesn’t like E10 so it’s kind of relevant for me..

submitted by /u/sdoobler
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