Yes, the octane is lower out that way, but I never added octane boost nor did I have any problems while riding. My bike did run pretty hot when sitting in traffic, but I think it is running a little lean. My buddy has an '05 RG with the 88 c.i., bumped up to a 95" via stage 3 kit. His compression is 10.5-1 and he ran okay on the fuel also. If yours was pinging you may want to have the tune checked.
-TLKurtz (Mr. Wizard) - Blackhorse Cavalry Nomads VMG member (2/11 CAV - East/West German Border)
2015 RGS - Vivid Black and loads of fun.
Reside in Vegas. I keep cold beer in the fridge for all visitors.