If you check out the website I am sure it will answer any questions you have of Optimax Extreme.
www.100octane.com.au
Brief recap.....
It is a 5% ethanol based fuel (not 10%)
Ethanol is a natural product derived from sugar cane.
The small amount of ethanol will not hurt or dammage any part of your cars fuel system anymore than normal fuel does already.
Ethanol is an oxigen rich fuel around 30%