What octane fuel are you running?

Curious on Octane, setup, et blah blah
I have a 12.5:1 440 with six pack rods, stock crank ootb Indy EZ heads. Run
Low 10's and have experimented with 110, 112, and 118 rockett brand.
Haven't seen really much change in et, but never a direct back to back comparison. 118 seems to sound crisper. Bouncing around the idea of trying a q16 for the heck of it.
What are you guys running? Thanks.