Biodiesel is currently about one and a half times more expensive than petroleum diesel fuel.
Part of this cost is because the most common source of oil is the soybean, which only is only 20% oil.
However, the costs of biodiesel can be reduced by making biodiesel from recycled cooking oils rather than from new soy beans, or by making it from plant matter with higher oil content.
It takes energy to produce biodiesel fuel from soy crops, including the energy of sowing, fertilizing and harvesting.
Biodiesel fuel can damage rubber hoses in some engines, particularly in cars built before 1994.
You should check with the manufacturer before using biodiesel to see if you need to replace any hoses or rubber seals.
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