bill, believe you me, it's a big con. bio diesel is so easy to make - trust me, i've made it myself. it gives off almost nil emissions and our wonderful government taxes it more than normal diesel [at least over here]. you can make it from old chip fat, rape seed oil, you name it. the only drawback to it is the smell of chips in the air everywhere you drive. but there again, some of us like chips
ade!