Short answer is "Probably never", as we don't have the environmental groups to worry about down here. Our GA industry is growing smaller every year, so until the vast majority of the fleet is approved for unleaded, it doesn't make sense for any refueller to provide it. A second bowser, 2nd tanker (that wouldn't be often used), fuel going stale, etc etc. Too many headaches until we are dragged kicking and screaming into the 21st Century...