I find when I put 93(Chevron or BP Mainly)Top Tier in my '03, I get better gas mileage, smoother operations, and little to no pinging which is not the case with 87 octane. 93 Octane is also refined to a higher level...less varnishes and the likes.
Sorry, but I am calling BS on those claims.
The pinging maybe, but then that makes your FJR special from 95% of the others that don't ping on 87 octane gas.
As for the gas mileage, smoother operation, and a higher level of refining, I will emphatically say ********!!!!
Higher octane gas simply has more resistance to knock. That's it.
Perhaps some more detergents too, but 87 octane gas has all that you will need.
Octane is one of the most misunderstood subjects out there, with many giving premium gas all kinds of mystical properties. Soon, someone will tell me how premium gas saved their marriage, put their kids through college, and brought them a winning lottery ticket.
Do a google of 'octane', and do some reading for FACTS and the TRUTH.
The FJR per the manual only needs 87 octane gasoline unless experiencing pinging, so their is
no benefit whatsoever to wasting your money on premium.