SUNOCO CFR is a high quality unleaded fuel that conforms to FIA Appendix J regulations. Sunoco CFR has an oxygen content of 2.2% to enable a more complete and faster burn for consistent power, protection and sharper throttle response. CFR also provides excellent resistance to detonation in engines with compression ratios as high as 12.5:1. It is designed to be used as a direct replacement for Super Unleaded petrol without the need to remap the engine. However, if engines are remapped to the CFR further performance will potentially be unlocked.