In the US, anything over 94 RON is a mix of race gas. Some states have only 91 RON max, and others 93 max. I'm sure a lot of us would LOVE to have 99 at the pump. You probably have 20hp/20tq more than us, just with that gas.
There are a few random specialty gas stations (nearest to me is over an hour away) that sell 97, but the cost is 3 times that of 93 octane, since it is sold as race gas.
