Cetane is a powerful energy compound that improves the ignition quality of fuel. There is a direct relationship between a diesel fuel’s cetane number and its ignition point. The lower the cetane number, the longer the ignition delay. Fuels with high cetane numbers burn more quickly and more completely, resulting in smoother and quieter running engines, quicker engine starts, more power and improved fuel economy. In fact, The Engine Manufacturers Association (EMA) states, “Fuels with low cetane numbers will cause hard starting, rough operation, noise and exhaust smoke. Generally, diesel engines will operate better on fuels with cetane numbers above 50 compared to fuels with cetane numbers of the national average of 46.”