Byron Fuel 20% Quart 16% Oil Race RTR20 Gen2 Fuel Byron 20% Nitro - 16% Oil Race Fuel. Their latest Gen-2 Blend in quart size. The smaller size is cheaper to ship and when sourcing from a smaller bottle, you"ll use it up faster, thus you"re always using fresh fuel! Many top-level racers swear by Byron due to it"s consistency and power.If swallowed, call Poison Control Center 1-800-222-1222