1. Introduction Biodiesel has becomes a favorable fuel for diesel fuel substitute because it is a renewable fuel that has other advantages such as lower emissions, high cetane number, low sulfur content, and improvement of lubricity 1)~ 3). The utilization of biodiesel can promote the achievement of United Nation’s Sustainable Development Goal especially in a sustainable and renewable energy 4)~ 6). Biodiesel is defined as mono-alkylesters of fatty acids produced from trans-esterification reaction of vegetables oil or animal fats with short-chain alcohol, such as methanol. Biodiesel has been used as blended fuel with conventional diesel fuel. However the maximum blending of biodiesel is still limited by its disadvantages such as its calorific content, cold flow properties, and impurities such as monoglycerides3) 7). The higher biodiesel content blended into diesel fuel gives the lower calorific value 8) 9) that may affect the fuel economy that describes as mileage (km) per volume of fuel (liter) for vehicles. This effect has become an obstacle for commercialization of biodiesel in higher blending portion. In Indonesia, the implementation of biodiesel fuel has been regulated by the government 10) to improve from 20% of blending (B20) at 2016 to reach 30% of blending (B30) in 2020. The effect of B20 in diesel fuel vehicles has been investigated and compared with diesel fuel (B0) in a durability testing on a road test covering 40,000 km 11) 12). Due to its lower calorific value, for an average distance traveled, the consumption of fuel of B20 was around 0.5% higher compared to B0.