50:1 is not enough oil to provide adequate lubrication at all RPM's under load. 32:1 has generally been accepted as sufficient. Octane boosters might turn 93 octane into 94 octane at best. Your very best bet is to use 100 octane av gas. These engines are very sensitive to detonation so the higher octane really helps. Pump gas will change from city to city & station to station. Some pump gas blends use ethanol to raise the octane rating. Ethanol, like most alcohols can be corrosive to metal parts & damaging to rubber. Av gas has none of these additives & is the same no matter where you go. According to Motorgeek on here, depending on the ambient temperatures, you may benefit from mixing 4 gallons of av with 1 gallon of pump premium to aid in the mixing of the oil in the fuel.