In '07 I bought a Beta 200 new in the box. From day one it got nothing but VP race fuel, and full synthetic pre-mix at 80:1. More than 350 hours later, that bike had more compression than I have weight. That poor two hundred rode the Ute cup in '09, not to mention almost every weekend of hard riding for practice, and events. When I sold it two years ago, it still had the same top end(I never even took the cylinder head off), and like new performance. I'm no authority on the subject, just telling of my own experience.