If you had read you would have seen that I said it costs forty cents for enough chemical to convert the Burger Grease to Biodiesel, Not forty cents per gallon of Biodiesel. Even if the Burger Grease is free the conversion costs.
Homemade Biodiesel is a hobby not a growth industry-I think. But it's a growing hobby. I actually saw a biodiesel burning VW Rabbit festooned with grease-burner regalia on the road this afternoon and yes it had a distinctive tailpipe odor-smelled like a burning corncob. Production Biodiesel from grains will become commercially successful when regular diesel hits $3. And it might.