I'm not sure I remember the dates correctly but here's the timeline in Cal. CARB II reformulated gasoline was mandated in '96 and an octane shortage was predicted. There was a fair amount of public disclosure that premium would move from 93 to 92. CARB III came along and, with little public notice, premium moved from 92 to 91. I think this occurred after 2000 but with the way the years are slipping by, I can't be sure...