My experience that even well-running engines will sometimes have these deposits, regardless of fuel or cleaners. I had an early R6 that had significant carbon on the intake valves that ran great and had a true 155 mph top end, so if it was affecting performance it wasn't by much.
I think it stands to reason that if you jet your bike strictly for throttle response and performance, you're probably more likely to be running with excess fuel and this excess fuel is probably going to increase carbon deposits. Whether it is significant, I don't know.
I doubt octane has diddly-squat to do with it. There are rumors that higher-octane fuel has a better additive package, but I'm skeptical that the difference is significant enough to buy higher-than-required octane gas for this reason alone.
Personally, I wouldn't worry much about it. Of all the fuel/additives, I've seen enough data to think that Techron is probably the best, and perhaps the only way that really does much for this problem, but it works better to prevent deposits rather than remove them.
Last edited by markjenn; 05-04-2012 at 03:26 PM.