I looked into this a bit when I went over to France last year. From what I read, E10 should be fine on E89's. It is pretty standard over there so I think it is just something we are not used to so get a bit cautious. As I only filled up twice I went with premium for exactly that reason, even though everything said it would be fine with E10
The fair weather drivers might not like it,,,
“There have also been reports that E10 is a less stable fuel and that this can make it more difficult to start a vehicle that has not been driven for an extended period.”