The internet but don't believe everything you read! Just some of it. If interested in biodiesel, go here: http://biodiesel.infopop.cc/6/ubb.x?a=cfrm&s=447609751 - good forum
And here http://www.biodieselcommunity.org/index.php - more good info
And here http://www.utahbiodieselsupply.com/ and http://www.b100supply.com/ for good supplies.
Do not pay any attention to the Journey to Forever site. Not good.
I started making biodiesel 2 years ago and learned almost everything through these sites. Lots of great info. I'm a happy greaser!
Can't help you with any other alternative fuel.
Mark Chapman DP member #653;
1983 K2500 6.2 Suburban, 4" lift, 35" tires, ATS turbo, Banks exhaust/intake, pyrometer, tachometer;
1986 K5 6.2 Blazer, 2" lift, 33" tires, Banks intake, pyrometer, tachometer
1963 wife, one owner, average mileage for the age but in excellent shape, a keeper
1992 daughter, low mileage, pretty, limited edition, but requires some money to maintain
1995 son, sports model, very fast & peppy, time will tell on durability and maintenance costs
"Grease is good"