Not everyone lives in the Peoples Republic of Colorado, I know lots of guys who have spiked 91/92 with 107, but if you are a chicken find a Renegade fuel dealer they have unleaded with 97 octane. I just attended a seminar on their fuels and oils. Google them and call their tech line. Their Tech. Director in a great guy, college prof. and real drag racer. RD if you are serious about 85 you should call him.