Moving to California... how much timing to pull?
 

EFR6258 running up to 180kpa. I've been running this timing map for 3 years on 93 octane and it hasn't gone bang yet. How much should I pull once I have to start feeding this poor car the 91 octane horse piss they sell at California gas stations?
https://cimg2.ibsrv.net/gimg/www.mia...efffdc15b4.png

maybe 1 or 2 degrees. that's a conservative map