Thoughts on switching to Midgrade fuel?

[i-DSi]

My Honda CBF has got a lot of sensors (throttle position, MAPsensor, coolanttemp, airtemp, lambdasensor, bank angle sensor, rpm...) but I've never seen a motorcycle with a knocksensor.
My opinion: don't change to lower octane rate as manufacturers recommandation. You'll see that on that hot day, with a hot engine you need some power (think about your safety) and your engine will not deliver as designed and there's a risk on engine damage.
I would only risk it with a knocksensor, but even then your engine might not perform as expected.