XR8 is more reliable. But is also slower, uses sh*tloads of petrol. Does sound mint with an exhaust though. And they're not much slower than a stock XR6T either.
I'm in melbourne, it's at a servo in hastings lol, f*ck knows why its a bit out in the sticks to have 100 octane. It'd be surprising if they've actually sold any of it.