Why would you want to the engine was designed to run on unleaded and will run forever if you stay out of the mud and water.
Your right, a higher octane fuel burns slower and a low octane burns fast. That's whay the higher the compression ratio, the higher octane you need.To put what Justin said more simply, higher octane does not mean 'better' gas. It is of the same quality as low octane gas. Isn't a fuels octane rating nothing more than how fast it burns?