I had the impression that the v-power have higher octane too.. but apprently it is not (or may be just very little)..
taken from
http://www.shell.com/home/Framework...sts/fuels/optimax/optimax_faqs_ga_1602.html#4
What is the octane rating of Shell V-Power?
Octane ratings for premium gasoline vary across the country. The octane level of Shell V-Power is anywhere from 90 to 93 octane, depending on the region. It’s important to point out, however, that octane is not the only factor to consider when choosing a fuel. For example, many cars that don’t require higher octane can benefit from the cleaning power provided by Shell V-Power.
Shell V- Power premium gasoline actively cleans for better performance. It helps clean up deposits on intake valves and fuel injectors left behind by low-detergent gasolines. That’s because Shell V-Power contains more than five times the amount of cleaning agents required by government standards. If these deposits are not removed, some vehicles may experience hesitation during the initial warm-up period.