[cstavro]

you're on the right track. what is your hp goal? how much boost do you need to meet that on gas? what turbo are you running?

e.g. if you're running a gt6152, it runs optimally at 25-29#. buicks run 8.5:1 cr with this turbo (running low 11/high 10). with e85 and 25#, imo you'd be safe at 9.5:1 cr. just lower boost to eliminate kr (if any occurs). it's up to you and your goals. boost makes more hp than cr, higher cr will increase throttle response, and mpg. hth