Alternative products - rapeseed, sunflower, soy, and other vegetable oils and derivatives - are increasingly being used as diesel fuel. "Biodiesel" fuel - vegetable oil fatty acid methyl esters - have 8-10% higher density and two times higher kinematic viscosity than petroleum diesel fuel. This is reflected in operation in the diesel cylinder and the integral environmental and economic characteristics. The composition of the alternative fuel can be optimized by mixing "biodiesel" with light crude oil cuts. The fractional distillation curves are given for "Biodiesel," gas condensate, diesel fuel (summer and winter), and the proposed binary alternative fuel.