Blending palm biodiesel with diesel can change the properties of the fuel. The researchers looked at how different blends affect density, viscosity, flash point, and fire point. They found that adding more palm biodiesel makes the fuel thicker and denser, but also increases its flash point and fire point. Blending can make the fuel worse compared to diesel, but better compared to pure palm biodiesel. By analyzing the data, they created formulas to predict the properties of different blends.