I am running a DE this weekend and have 6 gallons of 100 octane on hand. I usually mix it 50/50 with 93 and make some 96 out of it.
I am not running it for more power, I am running it for safety for my engine. This is for my RX-7 and I like to use the higher octane to reduce the chance of detonation when things heat up.
Worse case scenerio I buy my gas at the track for an inflated price.