I'm the owner of Auto Science in Dallas Texas. The owners manual and sticker on the gas filler says premium gas. So defiantly don't use 87 octane. Use 91 or up. It will get better gas mileage and prevent detonation that can cause damage to the engine.
93 octane, one of the top tiers if available
Use 91 octane or higher octane rating premium gas for the 2009 Lexus RX350
Premium, 91 or higher
There are number of different kinds of gas you should use. The gas you should use depends on the situation.
Regular gas should be fine
E85
unleaded
You should use 93 Octane in your bike.
Premium
93
Regular
Use exactly what is recommended by Lexus as listed in your owners manual.