You can safely run more timing with high octane fuel which makes more power when it's all dialed in. Besides that racing fuel out of a sealed can is likely very close to it's spec. Pump gas is mystery meat. You could have varying co-solvents tankful to tankful. If I was heads up racing in a class that for some reason required 93 octane I'd be using 93 out of a sealed drum not my local gas station pump.