What octane fuel you using?

[mininsx_imp]

My first tank I used 93, second was 87 per the manual, and the third I put in 89. I'm still hearing some "rattling" on acceleration so I think I'll try 93 the next fill and see if I hear anything. On a side note, I've also got an '05 CBR1000RR Repsol that uses 93 octane and talk about engine noise, this thing's got it in spades! It makes all kinds of racket but everything I've read says it's "normal."