Over here in Oz, the best we've got is 98RON. We need 100RON to run a lot of Japanese imports (like GT-R Skylines, Supras, RX-7s).
To get around this, many people (illegally) run C16 (116RON) or Avgas, while highly-tuned V8s normally run C16 or methanol since running avgas on the street attracts a...