Yeah I saw some funny videos about that a little while ago. Like farm animals are natures lawn care service... Fuck off XD With bio there is also the practical use case as well. Right now, for pump diesel, we used to have high sulfur which help reduce wear in engine components, now we don't have that and have to put our own consumer additives into the fuel if you want to extend engine life. Bio around here doesn't have that, it's dirty and messy (for many different reasons) and destroys emissions equipment fast, which cost more then the vehicle is worth to replace. There is also, like ethanol, lower energy vs quantity which makes for worse consumption, and higher particulate quanity. I suppose proper refining these days probably is able to produce a "cleaner" product but that's what we've been dealing with for a while.