"I was speaking of 4bangers, don't know if it applies to scoots. Not familiar enough with the engines"
Depends on the motorcycle. A high compression engine will need a higher octane of fuel to prevent the fuel from combusting too soon in the cylinder, which causes pinging sounds. My bro' in law's Kawasaki GSXR 1100 uses, iirc, mid-octane gas. He averages 40 mpg
On a relatively low compression engine like my Honda Shadow 700, regular gas does just fine, and I average 55 mpg.
Exception to this would be in very hot regions, say texas or arizona in the summer, where the extreme heat can make regular fuel combust sooner than it's supposed to. In that instance, go with a higher octane, and the pinging goes away.
Sounds like snakeoil. I like my seals and fittings the way they are.
And in regards to the earlier statement of overheating water past the boiling point under normal atmospheric pressure wihout boiling, it can be done. I don't know about getting as high as 300 degrees, though. Get yourself a snapple bottle, or some other narrow necked glass bottle, fill halfway with water or so, and set in a microwave for a while on the high setting. Eventually, the water will spontaneously boil over, though 'explode' would be closer to the fact.