Why not to give vegetable oils a chance?

Cheaper to produce and requiring fewer industrial processing than biodiesel, vegetable oils are a great option to enhance the living standards in rural communities and to provide a cleaner fuel for urban transportation. Instead of relying on the economic, political and social pressure of the OPEC mafia, why not to develop an indigenous source of fuels suitable to the most distinct regional realities? And vegetable oils also perform well on older engines, actually better than regular diesel oil.