Dave you are right on...I use premium gas and additives and the 235 runs much better. Octane is a rating of several hundreds of chemical that make up gasoline. Octane is just a word to describe the mixture of said chemicals it's not a substance. A cup of good coffee is 5 bucks so a few bucks towards the health of the 235 is a no brainier. "The cheapskate will always pay more in the end". That's a fact.
