Wait... So 87/89 octane doesn't have additives? That's news to me.

Not as much as 91-93, hell you can even run 105 octane if you want and be perfectly fine, thats just really a waste of money. Never seen the commercials for shell super huh with nitrogen?

You can also run 87 octane and be perfectly fine. Seeing as that is what the engineers over at Honda designed the bike to run on.

The octane rating is a measure of the resistance of gasoline and other fuels to detonation (engine knocking) in spark-ignition internal combustion engines. High-performance engines typically have higher compression ratios and are therefore more prone to detonation, so they require higher octane fuel. A lower-performance engine will not generally perform better with high-octane fuel, since the compression ratio is fixed by the engine design.

This explains it all, yes and engineers at honda also tell you to change your car oil at 5k miles and your filter at 10k miles. Now are you really doing that? If you are then yes by all means run 87 in your car and bike if you'd like. But why "risk" causing detonation and possibly engine damage by saving a few cents here and there?

You do understand that engineers engineer cars and motorcycle to government specs and regulations right? They don't just do what they want, most cares in Japan are limited to 120mph, just like in France any car modification is illegal.

Most 05+ motorcycles run 91 octane, there not on 87 anymore and for good reason.

Because I don't risk engine damage? They aren't on 87 any more because they are higher performance bikes. I fail to understand why this is so complicated to understand.

higher performance bikes? its almost exactly the same engine, dif head, dif bore and stroke they still make comparable hp along with the exact same compression ratio.

any harm? no! any real benefit? No!

I run 91 - 93 depending on station in my F4, but its lil stickers said to run 91 in it so lol

haha playful thats a ron/mon rating though thats equivalent to a 87 octane rating in the US, its funny our bikes in europe run 91-95 but here we use 87. The bikes are identical.

It's obvious that you require the safety blanket of knowing you pushed 93 instead of 87. Some people don't. And you know what? That's perfectly fine. Don't try to fill someone's head with lies that is looking to save those extra pennies. 87 octane fuel is what the bike was designed for. There isn't going to be any engine damage caused by running 87 and 93. Don't you think after 6 years of production that Honda would have stopped printing 86+ in the manuals if it did? There are still plenty of additives in 87 octane fuel to keep the engine clean. There is no benefit to running 93 instead of 87 in an engine designed for 86+.

Thats true now I think of it lol. But regardless no harm will been done to our engines from running 93. As someone else said you could even run 105 in em and still no harm would come of it, just a lighter wallet lol.