Novaray64

I plan on taking my car to the track a couple times this summer and was thinking of throwing in some race gas. probably do a 50/50 mix with 92.
I am running a stock bottom end LQ4 at 12psi with meth and wanted a little more insurance. I understand that leaded gas will harm the o2, will it be ok since I will be mixing it with 92? Whats a good choice for unleaded gas?



Will using race gas affect my AFR since it doesnt contain ethynol?

thanks