Sorry Siggy, I've been putting 89 Octane in mine (both straight gas and ethanol blend) since day one, and have 23000 miles of flawless running on it. I still get 43 mpg as well pretty much consistently around town or on the open highway (maybe a few mpg more with steady highway cruising). Last time I looked in my carb throats they were just fine. And, now there is a local station pumping 89 octane Ethanol blend for what the other stations are charging for 87 Octane normal gas, so you're darn straight I'm going to take a 20cent/gal price savings. The more money I save on gas, the farther I can ride since I am not on an unlimited budget, and since our friends in the oil business continue the creep back up to $3 a gallon with nary a protest....