I don't understand why anyone would want to run a 700 RWHP car without the added protection of higher octane. As bad as gas is from pump to pump, you never know what kind of "Real" Octane your car is really getting. There's a lot going on in the cylinders to just have putrid pump gas in the tank.
Why spend the money building a bad ass motor only to skimp on the small stuff, that can blow it up?
Just my thoughts, but what do I know.