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12:1 you are gonna probably need an octane additive. I don't think the pump gas is gonna cut it at that ratio.
I will tell you first hand that the 12.5:1 pistons are perfectly fine on 93 octane. I've had the kit on my '04 speedy for a little over 2 years now, and she is a monster in compairison to the 790cc stocker. If I get on her at around 4,000 she will bring the wheel off the ground! Have not once considered putting octane booster in with the gas, but I'm starting to wonder what will happen if I did. 
I like the sound of that (I was planning to just run premium gas in it) The bike is all back together and just setting there. The nice 2 inches of snow last night will prolong my wait to take her out.
05 speedmaster - 1100cc, 11:1 racing pistons, Carillo rods, thunderbike cams, ported and polished head, 2mm over intake and exhaust valves, Barnett kevlar clutch, scepter pipes, oversize manifolds, 45mm HSR's, TTP stage 4 firestarter
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