i started out using normal 87 octane gas from the local cheap gas station chain here in town and using Honda H2 syn oil. it was ok and probably sufficient. however, i got a wild hair and started mixing half gallon 87 w half gallon 93 (premium) and h2; and my engine runs better and faster and probably hotter too; tho piston' cylinder and spark plug looks beautiful. no excess of carbon and its not too dry and messed up either. im a convert and not going back to straight 87 mix anymore, save for emergencies on long rides or the like.