BUT they do not mention the down sides..
I don't expect they would, the way Victa is going these days, they probably would like to keep the downsides quiet.
If it helps bring the 5 year lifespan of the new mowers down to 3, they'll take it!
Personally I will be switching to 95 when I can get regular 91, I refuse to use E10 in anything, especially my collection, as I have seen what it does and replacing vintage parts is not always easy.
I removed the "E10 fuel suitable" sticker from y car too, i plan to replace it with an equally official looking sticker reading 'E10 fuel not suitable' so that friends and family don't poison the car for me!
