The researchers made new biofuels from waste cooking oil and tested their properties compared to diesel fuel. They created three blends: Renewable Biofuel 20, 50, and 100. The biofuels had different viscosities and densities, with Renewable Biofuel 20 having the lowest density. Renewable Biofuel 100 had the highest energy release potential. These new biofuels could be useful in the fuel industry and for diesel engines.