There are many benefits to using biodiesel over petro diesel and, other than running a diesel engine, the two fuels have little in common so comparing them could be irrelivant. Biodiesel is an easy, inexpensive first step toward making energy solutions real now before petroleum reaches peak. Biodiesel is made from crops that are renewable for an ongoing but seasonally limited supply. Biodiesel emissions are non toxic. Biodiesel has a higher lubricity which helps the engine run smoother and longer. It is not necessary to kill anyone to gain access to biodiesel. Biodiesel supports local businesses and economy. Biodiesel is primarily carbon neutral. Biodiesel smells good.