Any downside to running 93 octane?
 

I know the F4i is designed to run 86, but I run 93 in mine. I figure it can only help. It's just injector cleaner anyway right? Am I wasting my pennies?

Yes. There is no benefit to running a higher than required octane level.

A thinner wallet!

Higher octane fuel has more resistance to burning. Therefor your injectors are pissing more fuel into your cylinders while you are pissing more money down the drain for the same effect.

Higher octane has a higher resistance to ignition not burning. To be honest this is a high compression engine and higher octane would be better for it. I don't think it was engineered to run into detonation but higher octane will prevent it.

http://en.wikipedia.org/wiki/Octane_rating

The higher the octane the more controlled the burn of the fuel. Octane is not a rating of the amount of energy in the fuel, you do not waste more fuel with higher octane.

running 93 octane is a waste of money and is of no benefit to our engines

Not sure if it's just my bike or not, but when i put 87 in my tank you can hear the knocking sound. So i figured why not just spend the extra 50 cents for the higher grade of fuel and stop the knocking. I think there r other threads that this was discussed before.

Yea i think some of you guys are just stupid (no offense though). Yes it was designed to run on 87 and yes its tuned for it, but honestly whats it cost everytime you fill up the bike an extra 20cents or wtv? Have you guys seen how much gunk 87-89 octane form? You're not paying for the higher octane but for the additives in the fuel and idk about you guys but ive been putting 93 in my car (91 required) and i have absolutely no gunk on my valves, on my pistons, on anything and its got 156k miles.

Putting higher octane in your motorcycle isnt a bad thing and wasting money, its like putting sea foam or fuel injector cleaner in your gas tank.

We did a test at work where we took 2 brand new crown victorias (designed to run on 87 or E85, which btw is 100-105 octane), we ran one on super and one on regular. Not only did the super run better but it kept the injectors and valves and fuel pump and filter so much cleaner. This was only done to 36k miles too.

I have a power commander on my f4i, should I be using higher octanes? I use regular right now. I bought the bike with everything installed so IDK what to run.

if oyu get it dyno tuned then get it dyno tuned on either 87 or 91/93 then stick with it and wtv you dyno with you're going to use that.