An oxygenated blend designed strictly for naturally aspirated engines. C45 offers the best performance in naturally aspirated drag race engines on the planet, outperforming even VP’s Q16! When tuned properly, C45 will handle up to 16:1 compression. With its 100 motor octane rating, pulling a couple degrees of timing upon first test/tune is recommended. C45 requires approximately 4 to 6 percent more fuel than VP’s Q16 so a purpose-built carburetor will most likely be required.