Hi All, I was amazed when I got my Vulcan 2000 and saw the 90+ octane requirement. When I got the bike it had 6k miles on it and was three years old. I was concerned about it sitting too much and thought I should add some Seafoam to the tank but the guy at the dealership warned me against it and stated it would lower the octane rating of the tank. He just recommended me using top tier fuel instead. Here are my questions: Is top tier fuel good enough to clean up the system without any other additives? Does Seafoam actually lower the octane rating and if so is it enough to cause alarm? Off topic question: Why does the Vulcan 2000 require 90+ octane when some sport bikes do not? Thanks for the help.