What issues are caused by ethanol’s attraction to water?

Ethanol molecules have a stronger bond to water molecules than to petrol molecules. In the absence of water, ethanol and petrol molecules will bond. When water is added to E10 fuel, the bond between the ethanol and petrol will weaken. When the percentage of water in E10 fuel reaches approximately 0.5%, the bond between the ethanol and petrol molecules will breakdown and the ethanol molecules will attach to the water molecules. This is called phase separation.

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