[falloutboy]

A friend of mine (here in Germany) tested it out a few years ago.
at this time we normally had E5 - since February we have E10 - he tried it p until E85 - the car ran fine - except starting / cranking got more difficult. Till you had to try several times (about 3 or 4 times) to crank it with E85.
The fuel consumption shot up and after about two years he stopped it, cause the more amount of fuel needed diminished the price advantage.

If parts were seriously hurt - cant say, but I doubt that it did major harm.

but it worked - so you may try it for yourself