there's other ways too. my grampa has long time been a farmer since he was a child and we own 120 acres about 45 miles north of tampa and hes thinking about planting an 80 acre plot of jatropha plant. its a native plant to africa thats highly poisonous but it grows during the rainy and dry seasons and it grows in poor or good soil. basically its really versatile. you put the seeds it produces through a advances refining processs involving high pressure crushing, steaming, and filtering and you get one of the most efficient bio-diesel oils. they are hard to come buy and it take 2 years for the plant to star producing seed but they are 75% sure they would work well in floridas climate. if he does this then you can bet im selling my 240sx and buying a turbo diesel vw.