E85 is a etanol bases gasoline with the sweedes are using A LOT now.
Good thing is the det point is a lot longer out, so you can get more agressive ignition = more bhp but negative side is the fueling is upped about 30-40% and itīs hard to find the det point because the area where it detīs is big, not like "normal" fuel.

Short description, hope you understand.