The 99 rating of Shell V Power is RON which is what they use in Europe. Here we use AKI (Anti-Knock Index) which is an average of RON and MON. 91 AKI = 97 RON and 93 AKI = 99 RON so Shell V Power isn't any higher than the others it just has more detergent additives. Here in the Mile High V Power is 91 just like the others. The drag strip here sells 101 octane unleaded which I run in my Golf R when I run there so the ECU will not cut timing or boost from my stage 2 APR tune that calls for 93 octane or better.