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What's the difference if you don't mind me asking?

Thanks for the other thread. I'm going to stick with 93 for right now. My bike runs like a champ and it's worth the extra $2.00 a fill-up to keep it as-is....call it superstition or ignorant....I just love my FZ and "wouldn't change a thing". I do need an oil change soon though.....I...

Got it.....confusing as hell. So, here's my question...can I switch back to 87 without damaging my engine? I'm using a synthetic oil and they tell me to not to go back to petroleum based.....does the same apply to octanes?

"Your Yamaha engine has been designed to use regular unleaded gasoline with a research octane number of 91 or higher. If knocking (or pinging) occurs, use a gasoline of a different brand or premium unleaded fuel. Use of unleaded fuel will extend spark plug life and reduce maintenance costs."...