so Gobiodiesel - portland's biodiesel coop - is selling their fuel for $1.99. to purchase this fuel i would need to buy into their group (one time membership fee of $100) and then volunteer at the coop every so often. seems like a great deal to me. i want to make it on my own, but that's a ton of work. anyway, i will have made my $100 fee back after buying 100 gallons of fuel, assuming that while i'm buying biodiesel for $2/gallon, petro diesel maintains an expense of at least $1 more per gallon. what do you think? am i processing the advantages/disadvantages right?