Nothing wrong with the car, just top if off with 91 octane. Don't (you can't really) go WOT, also cold start will be horrible but you'll get by.
I can tell you from experience that if you try to go WOT with straight E85 with stock fuel system it will close the throttle due to lack of fuel pressure.
If you want to drain the fuel, there's a schrader valve on the low pressure fuel line, just attach a line there with car running and put the open end into a gas can.