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Density is a very important fuel property because it influences production, transportation, and distribution processes as well as all processes that take place in the internal combustion engine. Elaborating models to describe the density of biodiesel–diesel–bioethanol blends with a high content of biofuel facilitates the production of blends that comply with the standard quality requirements for density and the modeling and simulation of injection and combustion processes. For predicting density of rapeseed oil biodiesel–diesel–bioethanol and used cooking oil biodiesel–diesel–bioethanol blends, 2×15 ternary mixtures were prepared, having a maximum amount of biofuel of 30%v/v. The concentration of biodiesel and bioethanol varies between 5% and 25%, in increments of 5%. Their density values were determined in 15 steps in the temperature range of 273.15–343.15K. Based on experimental density values of …