the manual says to use 96 octane or higher and premiume is only 92
There's a difference in octane rating systems. The manual is specifying RON octane ratings. In the US octane rating is displayed in AKI. In some east coast states, up to 94 AKI (98 RON) is available . In Colorado as well as parts of the Midwest (primarily Minnesota, Iowa, Illinois and Missouri) ethanol-based E-85 fuel with 105 AKI is available . Often, filling stations near US racing tracks will offer higher octane levels such as 100 AKI . California fuel stations will offer 87, 89, and 91 AKI (91, 93 and 95 RON) octane fuels, and at some stations, 100 AKI or higher octane, sold as racing fuel.
For us in central Missouri, the best pump fuel to use in four stroke race bikes with stock engines is Conoco/Phillips 93 octane that is labeled as "No Ethanol". Some other brands will have an identical fuel as well, but I have found that BP's 93 octane (if the station has it) does contain ethanol.
Gas mixtures vary greatly from region to region and distributor to distributor, so you can't even count on a particular brand in one area to be identical in another.