- Yes, but the eco warriors’ limited intelligence do not know this.
- Yes, and E fuels ARE higher octane thane fossil petrol, so for a correctly tuned motor, E fuels are a blessing…!
Except that as delivered from the pump E5 is usually 98/99 and E10 is 95 octane - and I’ve yet to see E85 on a UK or French forecourt.
Its quite prevelant around Tours, never used it and not sure why I would?
If the parts of engine are built to take it, concerns over rubber part degradation may or may not be true.
It’s one of those if you need it, you know you need it kind of things.
Typically highly tuned/remapped engines.
Yep it’s true. certainly vintage/classic from the “good old days”… 
France is one of the highest users of E85 - it will be a small forecourt that does not have at least one E85 dispenser.
Outside of a pump or two around Silverstone and some other tracks, you will not find any in brexshitland due to british stupidity in building an E fuel distillery in Scotland before working out that transport of raw materials in and Efiel out far exceeded the RRP 
Do not, repeat, do not use E85 fuel in your car unless it has been especially mapped/tuned for the fuel or your car is manufactured to run with either or (usual indication of this is a yellow fuel filler cap)