Great question!
Do you have access to biodiesel? I am curious because even if I wanted to run biodiesel, I would not know where to find it (at least in the two states I spend my time).
In Europe, biodiesel is standard as B20 (20% biodiesel) or even B80 (80% biodiesel).
Vehicles have recommendarions as to what mix to run. If its not recommended, the manual will say it, too. Whenever I had rental cars (in Europe) with a turbo diesel engine, they would have a B20 sticker at the fuel cap.
What advantage do you see from using biodiesel? Access to cheaper fuel?
Do you have experience with using biodiesel or making it?
I looked into making biodiesel about 20 years ago. When I saw what it would take (gathering the fryer grease from restaurants, heating and filtering it, mixing methanol, lye, do titrarion testing, boilng off the ethanol, filtering the parafin / wax / soap, etc). By the time I added up all the time required to build the system and later on making a batches of biodiesel, I went right back to the fuel pump.
I think, if one has a solid 2 days a month to make a 55 gallon drum (or two) of biodiesel, why not. As for me, spending a whole weekend on it is not worth it.
Because biodiesel is made with methanol, it can be really harsh if the ethanol is not cooked off. Its about like running a degreaser through the engine. I do trust an industrial process that has quality control. I woukd not trust my biodiesel cooking. I do not eant ro go with trial and error to see what works in any of my vehicles.