Reduces our dependence on foreign oil. Reduces air pollution. It's a renewable fuel. The U.S. could be energy self-sufficient with hydrogen. It's a clean-burning fuel that reduces vehicle maintenance.
Engines can last longer.
Produced domestically from renewable resources. Nev. The fuel, made from either soybean oil or recycled vegetable oil from restaurants, avoids the release of carbon monoxide and the small particles released by burning traditional diesel. It doesn't cut down on smog-causing nitrogen oxide, however. And, yes, it does make the exhaust smell like french fries. Biodiesel has some drawbacks.