I'm no expert, it all goes over my head. My brother in law, he's 54 today and has worked in the same hire place since he was 17, so I refer to him about my chainsaw, a 20 yr old Stihl 170. Expected to work once in a blue moon (when I can get someone to start it!) He told me not to worry, put the E10 in it, same as the Stihl hedgecutter we have. Has always said though to not leave fuel in them. (The place he works for is a Stihl specialist!)
My car, an 06 kia, according to the website, safe for E10. Due to monthly visit to vet 30 miles away, I can guarantee the car is run at least once a month. But I run her on the E5. £1.55 a litre around here, don't let car go below half a tank!
The day I went to pick the tup up, £25 to top up, 40 miles there, 40 miles back, called at the same garage before I got home, £23 filled her up. "Weren't you here a earlier?" I was asked!