I have used E10 in my cars when I have been abroad and I have not noticed any difference. Some say they don't start as well and apparently vapour locks in the fuel pipes are more common as it has a lower boiling point.
The big problem with Ethanol is that is corrosive to some parts used in older vehicles, I am sure I have read it can destroy the rubber in some types of fuel pumps and brass in the float bowls of cars with carbs.
At 5% and 10% I would not worry to much but if it becomes more than this you might need to replace parts in the fuel system.
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