a stock blaster shouldnt even run under 92. found that out the hard way....when i had mine, i had top end issues running 87. you should be able to run 92 on a BB. when you start to build an engine for higher compression, you'll have to make the jump. but if you arent planning on doin a ton of work to it, you can easily run premium.
my banshee runs premium fuel. just to give you an idea....