You guys are right...seen it on the news. The feds caught a guy near here making his own biodiesel and charged him a bunch of taxes. They said they were working out a payment plan so that he could repay the government a little at a time. Uncle Sam doesn't like you taking money out of his pocket. Last time I heard, a lot of diesel engine manufacturers aren't allowing the use of biodeisel, so that could affect your warranty (if your vehicle is under warranty).