Flox
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Tests in the early 1960's showed mixtures of liquid fluorine and liquid oxygen (dubbed 'FLOx') to have higher performance with kerosene than fluorine alone and improved handling. FLOx 30 (30% LF2, 70% Lox) could be burned in Atlas rocket motors and improved performance by 5% compared to Lox and nearly identical to that of pure fluorine. FLOx 70 (70% LF2, 30% Lox) had the highest performance, with a specific impulse 8% better then LF2 alone and 15% better than Lox alone.