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Sadly I have no data, but I've been using Chevron, Shell, and 76 in that order for my performance cars ever since my mother got her first 1999 corvette.
If you want to be super safe, do like AlpsRider recommended. Do a bit of math to determine the amount of 91 and 100 octane you need to hit 93. I have a 76 near me in Pasadena that sells 100 octane for 9.99 a gallon. I squirt in two gallons before track days in my WRX to ensure quality fuel is in the tank.
Alternatively, I believe you can still buy a barrel of proper octane booster online and have it shipped. It isn't terribly cheaper though.
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