General types of renewable carbon sources have been considered to be suitable for production of drop-in biofuels with minimum oxygen content, fully compatible with conventional fuels. The methods for processing different feedstock types have been discussed, their main advantages and drawbacks are indicated. Preparation of drop-in fuels from vegetable oils and waste of biodiesel production is possible in the framework of current methods without significant capital investments. Processing the pyrolysis products of lignocellulose biomass is fraught with a number of technical and technological problems, being currently at the research-and-development step.