VP’s AMA SX/MX legal unleaded fuel for motocross and supercross, engineered to generate maximum horsepower in 4-stroke applications in conformance with AMA Pro Racing rules. Makes more power than any other AMA-legal fuel on the market! Requires minimal jetting/mapping changes and will not require radical changes in ignition timing like other fuels on the market. Pro6-HT offers better octane value over Pro6 and a lower RVP which is better suited to the higher air temperatures associated with outdoor motocross. Contains MTBE.