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=B20 Biodiesel= B20 biodiesel is a mixture of 20 percent biodiesel and 80 percent regular diesel. There are other blends of biodiesel, such as B5 and B100 (5 percent biodiesel and 100 percent biodiesel). B5 is used because it can be used in any diesel engine, but since B20 also can be used in any engine, B5 is becoming less popular. B100 is much cleaner than regular diesel, but because it is also more corrosive, it requires modifications to run properly. B20 is essentially a compromise between these two. it combines the cleanliness of B100 (though it is reduced), and the ability of B5 to be used in any diesel car.

B20 is being used by many companies across the United States to power their fleets, but it is not yet commercially available.

Biodiesel is more corrosive than ordinary diesel, so a car that runs on any concentration of biodiesel is going to require part replacement sooner than it would running on regular diesel.

B20 is definitely not the final answer in the fight against air pollution, but it is definitely an important step in the process.