Its cleans the crud left behind from the dino diesel. What I've read is that if you blend the fuel and slowly increase the amount of bio in the blend each time you fill up, it will clean the lines slower and there is less chance of clogged injectors and filters. Its called a DPF and on my Duramax its on the outside of the engine, not inside like on the Fords, from what I've read. The only problem with it is the sensor and it can be tripped easy. In fact, mine tripped on the way to Canada this winter when my brother borrowed it. But, that was because some snow got past the air filter. The dealer just had to reset it. It can also be deleted, so it will never be tripped. See, but I'm not talking about going to the fuel station and filling up with Bio that someone else made that's much more expensive. I'm talking about making it myself for 25% of the cost I would have to pay at the pump. If I was driving as many miles as you are and the manufacturer rated the engine to run B20 (20% Bio) and I could make it myself, I would definitely be using it. You would be saving a ton of money every month just by running 20% Bio. Again, I'm not talking about driving down to the local BP and filling up at their pumps.
Google Josh Tickle. I believe he had A LOT of "how to" info on his website veggievan.org, though I know he has since contributed a lot to the industry especially on the left coast.
Dan, Check out greasecar.com they have info and parts/kits to make a dino diesel/veggie oil conversion. It looks like that is what you are wanting to do. As far as clogging injectors, it is a possibility as true biodiesel will clean out the fuel system deposits left from normal fuels. http://www.biodiesel.org/what-is-biodiesel/biodiesel-faq's
Your right. I wasn't thinking right. If I made It myself the savings In what I spend would more then likely outweigh the drop In fuel mileage. Still though I'm waiting for someone else who does hauling like myself to give It a go 1st. I can't have break downs. Good discussion.