in australia, v-power is only 98 but few years ago, shell bring out a better version of v power, it called V Power Racing with 101 Ron. But because Shell didnt sell enough of it, shell stopped selling those fuel anymore.
Since then, I bought fuel that was pump out from Japanese import off the importer for my last car. Because in Japan, you can get 103Ron off the street pump.
About Octane booster, I tested with few brand and actually putting the car onto the Dyno machine. There are very little improvement on both power and km. These day, I been lucky enough to get to know some people from the local v8 supercar team. They been helping me to get these octane booster and it works pretty well. I been able to get more KM out of the Abarth but I have not put it onto the Dyno yet.
Standard 98 Ron Fuel, I can get around 400km out of a full tank and with the booster, I been able to get 430-440 out of the tank.