Oxygenated fuels contain, what else?, an higher percentage of oxygen than pump gas allowing it to "burn better". This translates in better performances, period. Think adding a handful of ponies without touching anything: ignition timing, fueling, compression ratio... all stock. Fiddle with the bike settings the handful will become a substantial gain.
Of course there are one or two drawbacks.
The first is the price. This stuff is about four-five time more expensive than premium pump gas, maybe more now that refined products prices are on the rise.
The second is maintenance. While VP maintains their latest products (M8-1, MR12 etc) are quite stable, I wouldn't risk leaving that stuff in the tank after use. Normal practice is to drain the remaining oxygenated fuel at the end of the track day, pour in some regular unleaded and run the engine a bit to flush out any racing fuel that's left.
If you can live with high prices and remember to flush the fuel system after each use there are no drawbacks.
Non-oxygenated race fuels, like the VP C12, aren't worth the hassle. They are engineered to be used in high compression engines (12,5-15:1 CR). How many SP's run that CR?
