I have to disagree to a cetain extent, being in the oil business and all. You most certainly will get better fuel economy running a higher octane fuel, and you will most certainly help your fuel system(especially injector nozzles) useing a better quality fuel. Done many ,many tests on the different fuel ratings and always had better results with the higher octane fuel( these test are on EFI cars and trucks,and not motorcycles, but same applies ). We have taken 2 identical cars, ran them on the same engine oil, run 1 car on the cheapest fuel(87) and 1 on the best grade here(94), and after a 100,000 km tear down found far less carbon build up on the 94 and a much better fuel injector spray pattern with the 94. The 94 always got .9 to 1.8 mpg better than the 87. Do you need to run more than 87 in our bikes, NO, will you be better off in the long term running 94, YES, not as much as a lower reving car engine that will build up more carbon. Due to our high revving engines in the FZ8, if you are running mostly over 6000 rpm ,carbon will not be that much of an issue, so you are somewhat correct in your statements as pertaining to our FZ8. You do get a better ,more efficiant burn with the higher octane numbers, fact.