The best all around leaded racing fuel ever made. Recommended for compression ratios up to 15:1 satisfying the needs of 75% of today’s automotive race engines. One of the winningest fuels in racing history C12 has been the preferred fuel for drag circle track and road racers in North America and around the world. C12 is also the best all around two stroke fuel. Works great in vintage air cooled two strokes as well as new engines.