 At Hot Shot Secret, we share the science behind common diesel problems. For example, diesel fuel cetane levels. The cetane rating in diesel fuel is 42 to 45. Most diesel engines operate more efficiently with a cetane rating of 48 to 50. One treatment of Hot Shot Secret Diesel Extreme will raise your cetane seven points, increase fuel economy, and improve cold starts. Hot Shot Secret Diesel Extreme is available nationwide at truck stops, fine farm and auto stores, and online at hotshotsecret.com.