Biodiesel is available now as a = blend (B20) or as a pure fuel (B100).  I have been researching biodiesel since I = got my '82 westy diesel, and this fuel looks like good news.  =
 
Reduced emissions, = particulates, and a 100% sustainable fuel.  I believe it is classified as a cooking = oil, so personal storage of 55 gal drums of the fuel may be possible in your garage.  Check with your fire dept. hazmat regs.  =
 
I am also checking with my = local Public Works department because they are running B20 in all of their trucks and = heavy equipment.  I am hoping to buy biodiesel from them.  = Alternatively a company called World Energy Envirodiesel will ship = biodiesel to your door in 55 gal lots.  The cost per gallon is a bit higher due = to shipping costs, so forming a buying Co-op may be a good idea.
 
There is a conversion available that = allows one to burn un-refined vegetable oil (from your local restaurant - they may = pay YOU to get rid of it)  The kit involves a switch that allows you to = start with pure diesel (or refined biodiesel) and switch over to cooking oil when = the engine warms up (there is a heat exchanger around the fuel feed = line that keeps the oil fluid) and when you are done traveling, switch over to = diesel to flush out the injector lines. 
 
Here are some interesting = links:
 
D.O.E. Biodiesel information site = (requires Adobe acrobat reader)
http://www.biodiesel.org/d= efault2.htm
 
National Biodiesel Board (lots of = good links)
http://www.biodiesel.org/d= efault2.htm
 
World Energy's Envirodiesel (they = ship Biodiesel to your doorstep)
http://www.wor= ldenergy.net/Individual_buyers.html
 
This is a really comprehensive = comparison of diesel and gas engine theory
http://www.diesel-= central.com/News/cackle.htm
 
Grease Car site (vegetable oil conversion)
http://www.greasecar.com/Home= .html
 
Veggie Van site
http://www.veggievan.org/
 
World Energy = Envirodiesel
http://www.wor= ldenergy.net/Individual_buyers.html